Einstein, DavidBiblio.com
1980 resultados
ref. 0078824028.Gpaperback. Good. Access codes and supplements are not guaranteed with used items. May be an ex-library book. paperback
ref. 1298941474.Ghardcover. Good. Access codes and supplements are not guaranteed with used items. May be an ex-library book. hardcover
ref. 101957027X.Ghardcover. Good. Access codes and supplements are not guaranteed with used items. May be an ex-library book. hardcover
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1935ref. 1383623/05/1935. He prophesizes however that the road ahead for the Jews will be “arduous and very painful” The Institute for Advanced Study in Princeton New Jersey was founded in 1930 by educator Abraham Flexner with funding from department store magnate Louis Bamberger. Flexner first recruited noted mathematicians from Princeton University to join the Institute then broadened its scope by including established scholars in economics politics and humanistic studies. In 1932 Flexner offered Einstein a faculty position at the Institute. Einstein’s decision was effected by historical events as in January 1933 Adolf Hitler became Chancellor of Germany. Soon after Einstein made the decision to resign from his Berlin position give up his German citizenship and accept the position in Princeton. The ocean liner Westmoreland which carried Einstein at age 54 to what would become his new home country arrived in New York Harbor on October 17 1933. <img class=""alignnone size-full wp-image-24695"" src=""https://cdn.raabcollection.com/wp-content/uploads/20231204145639/einsteinsig.gif"" alt="""" width=""1920"" height=""1080"" /> Einstein found the Institute and life in the United States congenial so in April 1934 just six months after his arrival Einstein announced that he was staying in Princeton indefinitely and assuming a permanent full-time status at the Institute. He would remain in the United States the rest of his life. Meanwhile he was very much a celebrity and was invited to the White House to meet with the Roosevelts. He politely declined saying he did not want to call attention to himself a position that German Jews had become accustomed to adopting during the rise of Naziism. However the First Lady Eleanor Roosevelt intervened writing Einstein directly requesting his presence. So Einstein and his wife Elsa arrived at the White House on January 24 1934 had dinner and spent the night. President Roosevelt was able to converse with them in passable German. Among other things they discussed Roosevelt’s marine prints and Einstein’s love for sailing. On learning that the Einsteins had decided to stay in the United States Roosevelt suggested that the Einsteins should accept the offer of some Congressmen to have a special bill passed on their behalf that he would sign granting them citizenship so that they would not have to endure the five year waiting period. The Einsteins declined the President’s generous suggestion saying they wanted to be treated like any other applicant for American citizenship. Because the Einsteins had not been sure of their ultimate destination and declared themselves as visitors instead of immigrants when they arrived in October 1933 this meant that they would need to leave the U.S. and return again to declare intention to seek citizenship. The United Jewish Appeal UJA planned a fund-raising dinner in Einstein’s honor for May 28 1935. This was exactly the time the Einsteins had set aside to leave the country to perfect their citizenship so he was forced to decline the invitation. He did however provide them with a statement that was received by the UJA on May 25 the very day the Einsteins stepped onboard the Queen Mary to travel to British-owned Bermuda for a few days to satisfy the formalities. The royal governor was there to greet them when they arrived in Hamilton and he recommended the island’s two best hotels. Einstein found them stuffy and pretentious. As they walked through town he saw a modest guest cottage and that is where they ended up. <img class=""alignnone wp-image-32085 size-post-window"" src=""https://cdn.raabcollection.com/wp-content/uploads/20240908143641/Einstein-May-23-1935-1-1600x968.jpg"" alt="""" width=""1600"" height=""968"" /> Typed statement signed in German Princeton May 23 1935 time stamped as received on May 25 to be read at the UJA dinner and issued to the press accordingly. It takes the moral high ground but warns of great dangers ahead. ”Unfortunately because of non-deferrable obligations I can only express in writing my recognition and gratitude for the assistance provided to the many unfortunate people by the dinner on the 28th of May. We can gain consolation in this critical time if we compare the moral standard of our friends and our enemies with each other. The result of such a comparison shows us that our way for world history can be considered the better one even if at times it is arduous and very painful.” Our research indicates that this important statement is unpublished as the dinner was postponed and it was never released to the press. But even this moving and forceful statement was not enough for the event organizers. Learning that Einstein could not attend they postponed the dinner. Instead the $50-a-plate dinner for the benefit of the UJA arranged by that organization and the Council of Jewish Organizations was held in New York City on June 26 with Einstein in attendance. About 1000 people attended the banquet at which Einstein spoke. In his speech Einstein returned to the same theme of morality as in the above statement saying that the ""moral disintegration and intensified national egoism"" of the times requires all Jews to strengthen their ranks to preserve Jewry. Of foremost importance he said was the upbuilding of the settlement in Palestine. On June 28 the UJA announced it was using the proceeds from the dinner to aid German refugees in New York City by allocating funds to local agencies equipped to care for the refugees. Einstein reentered the U.S. from Bermuda on June 3 1935. On January 15 1936 the Einsteins submitted their declaration of intention to become citizens of the United States. <img class=""alignnone wp-image-25018 size-post-window"" src=""https://cdn.raabcollection.com/wp-content/uploads/20231204144051/Folder-site-11-1600x1327.jpg"" alt="""" width=""1600"" height=""1327"" /> unknown
1961ref. 714603PN. New. 1961. Soft Cover. Date is original print. This is a reprint edition. . PN paperback
ref. 0994006918.Gpaperback. Good. Access codes and supplements are not guaranteed with used items. May be an ex-library book. paperback
1921ref. 302276Leipzig Felix Meiner 1921. 1921. First edition. 8vo. Foreword by Raymund Schmidt. Articles by Oskar Kraus Friedrich Lepsius Paul F. Lincke Joseph Petzoldt. Text pages numbered 334-500. Original stiff green wrappers printed in black. Very good. Cover title: Zur Relativitatstheorie. Kraus' article entitled: "Fiktion und Hypothese in der Einsteinschen Relativitatstheorie.". 1st Edition. Soft cover. Very Good/No Jacket. Leipzig, Felix Meiner, 1921. paperback
1929ref. ZB727262Leipzig : J.A. Barth 1929. 5. Folge 5th Series. Volumes 1 through 43 1929-1943 ALL PUBLISHED; all bound ex library else text clean & bindings tight. - If you are reading this this item is actually physically in our stock and ready for shipment once ordered. We are not bookjackers. Buyer is responsible for any additional duties taxes or fees required by recipient's country. Photos available upon request. Leipzig : J.A. Barth unknown
2005ref. b0979Chamberlain Bros. 2005. X310 pages. New Hardcover with sealed CD. New DJ. 8.5"x5.8"x1.0". be35 Chamberlain Bros. hardcover
1950ref. 465431950. 8vo. Original proof-copy of the latest stage presumably final proof in the same format as the printed version and with no corrections printed on rectos and versos. Stapled twice in left margin. A few marginal creases. A proof- number to upper left corner in red ink 297. Pp. 109-148 tipped-in errata slip at p. 147. Very rare original proof-copy of the two highly important appendices for Einstein's "The Meaning of Relativity" third edition 1950 the second appendix being one of the most important pieces Einstein ever wrote namely the appendix "in which he described his most recent work on unification" Pais and the work which was hailed by The New York Times under the heading "New Einstein theory gives a master key to the universe". The first appendix which appeared for the second edition of the work remained unchanged throughout the history of "the Meaning of Relativity" and was written because "Since the first edition of this little book some advances have been made in the theory of relativity. . The first step forward is the conclusive demonstration of the existence of the red shift of the spectral lines by the negative gravitational potential of the place of origin" . A second step forward which will be mentioned briefly concerns the law of motion of a gravitating body." . A third step forward concerning the so-called "cosmologic problem" wiil be considered here in detail." pp. 109-10. The present 40 pages constitute the final proof-copy of the entire appendices I and II to the Generalized Theory of Gravitation exactly as they appeared in the third edition Princeton in 1950. Einstein's "The Meaning of Relativity" was originally published in 1922 on the basis of his "Vier Vorlesungen ueber Relativitetstheorie" given at Princeton in 1921. A second edition with an appendix appendix I appeared in 1945 several issues and editions of this appeared also and in 1949 the third edition with the seminal Appendix II printed for the first time appears also appeared in 1950 in Princeton. In 1950 a revised edition of the third edition appears having Appendix II slightly revised and in 1953 the heavily revised fourth edition appears. THIS IS THE PROOF-COPY OF APPENDICES I AND II FOR THE "THIRD EDITION INCLUDING THE GENERALIZED THEORY OF GRAVITATION" PRINCETON 1950. The main focus of the work throughout all these editions of the work since 1949 is Appendix II which deals with Einstein's main interest the generalization of the Gravitation Theory which was to unite the general theory of relativity with electromagnetism recovering an approximation for quantum theory and presenting us with a theory to explain the universe as a unified entity the ultimate goal for the greatest physicist that ever lived. "This was Einstein's ultimate response to the mechanical-electromagnetic crisis in physical theory he had first talked about in the opening of his 1905 light quantum-paper." Nandor in D.S.B. p. 330. It was indeed Einstein's aim to provide an explanation of the universe through his unified field theory although he was well aware that his sort of field theory might not exist. However even the establishing of the non-existence of it could bring us closer to an explanation than we had ever been before. There is no topic of greater importance to Einstein than his theory of unification. "In 1949 Einstein wrote a new appendix for the third edition of his "The Meaning of Relativity" in which he described his most recent work on unification. It was none of his doing that a page of his manuscript appeared on the front page of "The New York Times" under the heading "New Einstein theory gives a master key to the universe". He refused to see reporters and asked Helen Dukas to relay this message to them: "Come back and see me in twenty years"." Pais p. 350. unknown
2005ref. G9875505870I5N00Longseller 2005. Paperback. Acceptable. Readable copy. Pages may have considerable notes/highlighting. ~ ThriftBooks: Read More Spend Less.Dust jacket quality is not guaranteed. Longseller paperback
2010ref. 220730001McFarland 2010-09-10. Hardcover. Like New. 7x5x1. Hardcover. Near fine with minor shelf wear. Tight binding. Clear text. For any additional information or pictures please inquire. McFarland hardcover
2010ref. ANAIS-0786447737McFarland 2010-09-24. hardcover. Good. 25.7x17.8x2. Buy with confidence. Excellent Customer Service & Return policy. McFarland hardcover
2017ref. 1-1476667918McFarland Publishing 2017. Paperback. New. reprint edition. 258 pages. 10.00x7.00x0.75 inches. McFarland Publishing paperback
1922ref. 2081002109000573SPRINGER-VERLAG 1922. Soft Cover. Fine. Number of pages: 15 SPRINGER-VERLAG paperback
1920ref. 1433Berlin: Julius Springer 1920. 1st Edition. FIRST EDITION IN ORIGINAL WRAPPERS OF EINSTEIN'S LEIDEN LECTURE EXPLAINING AT LENGTH HIS THEORY OF THE ETHER ALONG WITH THOSE OF LORENTZ & MAXWELL. Very good condition. "Einstein's lecture at the University of Leiden on the occasion of his appointment as a visiting professor summarized his current views on the ether and retrospectively looked at the development of his opinions on the physical properties of space" Calaprice The Einstein Almanac 86. In this lecture Einstein recanted his earlier denial of the ether writing: "Recapitulating we may say that according to the general theory of relativity space is endowed with physical qualities; in this sense therefore there exists an ether. According to the general theory of relativity space without ether is unthinkable; for in such space there not only would be no propagation of light but also no possibility of existence for standards of space and time measuring-rods and clocks nor therefore any space-time intervals in the physical sense. But this ether may not be thought of as endowed with the quality characteristic of ponderable media as consisting of parts which may be tracked through time. The idea of motion may not be applied to it" Einstein Ather 1920. In this lecture Einstein also sought "to reconcile his theory of relativity with his mentor's Lorentz's cherished concept of the aether. Einstein stressed that special relativity took away the last mechanical property of Lorentz's aether: immobility. However he continued that special relativity does not necessarily rule out the aether because the latter can be used to give physical reality to acceleration and rotation. This concept was fully elaborated within general relativity in which physical properties which are partially determined by matter are attributed to space but no substance or state of motion can be attributed to that "aether" aether = curved space-time" Wikipedia. CONDITION & DETAIL: Berlin Julius Springer 1920. Complete in original cream colored wrappers. 8vo. 22 x 15cm. 15pp. Slight toning. Very good condition. ITEM: Ather und Relativitätstheorie. Rede gehalten am 5. Mai 1920 an der Reichs-Universität zu Leiden. Julius Springer unknown
1930ref. 433061930. Offprint from Mathematische Annalen 102 1930. 685-697pp. Original printed self-wrappers. 233 x 157 mm. Very good apart from small split in lower spine. Weil Albert Einstein Bibliography 171. unknown
1941ref. 43508New York; German-Jewish Club Inc 1941. with no dust jacket. 1st edition. Original Illustrated Wrappers. 8vo. 192 pages. 23 cm. Illustrated. In German and English. Photographic and line illustrations in text includes many advertisements as well as a black and white frontispiece portrait of President Franklin D. Roosevelt. Includes foreword of endorsement by Albert Einstein. Handbook for recently arrived German-Jewish exiles from Nazi Germany with information and instruction on Jewish-German immigrant associations citizenship classes American life and customs particularly in New York City the text of The Star Spangled Banner and God Bless America and the meaning of such vernacular expressions as the 'Bronx cheer' and 'sawbucks.' Produced by the editors of the monthly magazine Aufbau which began publishing in 1934. A copy sold for $2000 with buyers commissions at auction in 2018. Subjects: Almanacs American -- New York State OCLC: 970939227 248298786 243425010 959348607. OCLC Locates 4 copies in North America HUC JHU NYHS LBI plus a copy at the US Holocaust Museum which they keep in their Rare Book Room. "L. T. Edelberg" penned on title page. Covers laminated and spine rebacked. German-Jewish historical institute stamps Otherwise Good condition. B HOLO2-110-12-RESA. New York; German-Jewish Club, Inc unknown
ref. 3421027307.Ghardcover. Good. Access codes and supplements are not guaranteed with used items. May be an ex-library book. hardcover
1979ref. 444510324cm by 18cm 89pp white dustjacket lightly soiled unmarked. Open Court Publishing Company hardcover
1999ref. Q-0812691792Open Court 1999-01-06. Paperback. New. In shrink wrap. Looks like an interesting title! Open Court paperback
1921ref. 1206201921. Signed. EINSTEIN Albert. Autograph letter signed. No place August 14 1921. Single sheet of cream lined paper measuring 7-1/2 by 11 inches; p. 1. $35000.Rare heartfelt autograph letter of recommendation written and signed by Einstein in German enthusiastically recommending his friend and colleague physicist Prof. Dr. Paul Epstein for an academic position.The autograph letter dated ""14 VIII 21"" written entirely in Einstein's hand reads translated from the original German: ""Prof. Dr. Epstein is certainly one of the most prominent living theoretical physicists of the German-speaking world. Without a doubt he would have been appointed to a German professorship a long time ago had his Russian nationality not stood in the way. Among Epstein's numerous original scientific papers two findings which advanced the modern quantum theory in crucial ways should be noted. After Mr. Sommerfeld as the first physicist who on the basis of special hypotheses had applied the quantum theory to a certain mechanical system of more than one degree of freedom Mr. Epstein discovered an important generalization of the quantum principle which established the application of the quantum theory for all quasi-periodic mechanical systems. Based on that general application of the quantum principle he then provided an analysis of the splitting of spectral lines in the electrical field Stark effect the accordance of which with the experiment provides one of the strongest supports for the Rutherford-Bohr atomic theory. I would like to add that I have also come to appreciate Mr. Epstein in personal interactions as a human being and that I had the pleasure of attending several scientific lectures given by him which enabled me to convince myself of his competence in delivering clearly understandable oral exposition. / A. Einstein.""Einstein and Epstein were friends and longtime correspondents who shared an interest in physics Judaism and the founding of Israel. Paul Epstein was a Russian-American mathematical physicist. He remains best known for his contributions to the development of quantum mechanics. Indeed he was one of a select group that included Lorentz Einstein Minkowski Thomson Rutherford Sommerfeld Rntgen von Laue Bohr de Broglie Ehrenfest and Schwarzschild. Born in Warsaw then part of Imperial Russia Epstein was brought up solidly middle class. He later stated that his mother recognized his potential at the age of four and predicted his future as a mathematician. Epstein studied mathematics and physics for his entire university career eventually earning a degree from the Imperial University of Moscow. He then went on to earn a Ph.D. at the Technical University of Munich in 1914 concentrating on a problem in the theory of diffraction of electromagnetic waves. However the outbreak of World War I rendered Epstein an enemy alien in Germany. Sommerfeld intervened on his behalf and he was allowed to stay as a private citizen and continue his research. In 1916 Epstein published an important paper explaining the Stark Effect using the Bohr-Sommerfeld quantum theory. After the war Epstein went to Leiden and worked as an assistant for Lorentz and Ehrenfest. In 1921Ñthe year this letter was writtenÑEpstein was recruited by Robert Millikan to join the physicists at the California Institute of Technology. Epstein accepted the position and stayed there for the rest of his career publishing extensively on quantum theory. Epstein was something of polymath and worked in numerous areas outside of quantum theory including work on air resistance the settling of gasses the theory of vibration and the absorption of sound. He was an avid supported of Freudian psychoanalysis including as one of the founding members of the Psychoanalytic Study Group that later merged with the Los Angeles Institute for Psychoanalysis. Epstein was also notably anti-communist and worried about the threat of nationalism.The areas of study mentioned in Einstein's letter of recommendation all came together to help form the science behind atomic and hydrogen bombs though neither Einstein nor Epstein anticipated quite where the science was headed in 1921. The letter mentions the Stark effect which is the shifting and splitting of spectral lines of atoms and molecules due to the presence of an external electric field. It is analogous to the Zeeman effect in which a magnetic field is the influence. The Rutherford-Bohr model presented in 1913 is a system consisting of a small dense nucleus surrounded by orbiting electronsÑsomewhat like the Solar System but with electrostatic forces instead of gravity. The Bohr model came to be recognized as a relatively primitive model of the hydrogen atom compared to the valence shell atom model. However because of its simplicity and the correct results it generates for certain systems it is still commonly used to introduce students to quantum mechanics.Overall this letter provides valuable insight into the scientific world during the height of Einstein's international career right when he first began traveling abroad and meeting fellow scientists internationally. The letter reflects Einstein's importance in the community and is a testament to Epstein's ability as a physicist. Original mailing creases. Fine condition. unknown
1932ref. 3054Caputh Germany: np 1932. First edition. Very Good. AN IMPORTANT SCIENTIFIC LETTER FROM EINSTEIN TO HIS CLOSEST MATHEMATICAL COLLABORATOR ACCOMPANIED BY A MANUSCRIPT LEAF OF CALCULATIONS IN EINSTEIN'S HAND ON THE SAME LINE OF RESEARCH. Although the original association of the letter and the leaf of calculations cannot be confirmed the two pieces clearly emerge from the same scientific context and have been preserved together. A superb pair from the final months of Einstein's German period. The Letter: In this intense and intellectually urgent letter Einstein writes to Walther Mayer his indispensable mathematical collaborator often referred to as "Einstein's Calculator" describing a newly conceived approach to the technical obstacles in their unified-field theory involving semi-vectors spinors and modified Dirac-type equations. Einstein tells Mayer he believes he "sees a new possibility" one that determines key constants in the system without resorting to the semi-vector construction. He then sketches the structure of the revised scheme points to the condition under which the full set of field equations reduces to a single one and warns that if this same collapse occurs in the general case "the whole thing would be useless." With his imminent departure from Germany he urges Mayer to examine the issue quickly and gives instructions for where a reply will reach him while en route. Dirac and De Broglie - Significance of the Scientific References: Of particular importance is Einstein's explicit engagement in this letter with the work of Paul Dirac and Louis de Broglie two of the central figures in early quantum theory. Einstein refers directly to the Dirac equations introduced only a few years earlier which provided a relativistic formulation of the electron and played a foundational role in quantum mechanics. He also invokes the De Broglie equations for matter waves reflecting his continued effort to reconcile quantum ideas with relativistic field theory. These references place the letter squarely at the intersection of Einstein's unified-field program and the emerging quantum framework he famously regarded with both fascination and skepticism. The letter thus documents Einstein actively testing whether concepts originating in quantum mechanics-Dirac's relativistic wave equation and De Broglie's wave-particle duality-could be absorbed into a geometrically unified classical field theory. Letters in which Einstein explicitly grapples with Dirac and De Broglie at this technical level are rare and represent an important record of his engagement with the central theoretical developments of the early twentieth century. Historical Context: Einstein's collaboration with Walther Mayer beginning around 1930 produced some of the most technically sophisticated papers of Einstein's later career. Together they developed new mathematical structures-semi-vectors spinors and higher-dimensional tangent-space formulations-used in their unified-field attempts. This letter dates from December 1932 only weeks before Einstein left Germany permanently and belongs to the final phase of their joint work published in the Sitzungsberichte of the Prussian Academy. Einstein valued Mayer so highly that he later persuaded the Institute for Advanced Study to create a permanent position for him the only such appointment ever granted for one of Einstein's collaborators. The Manuscript Calculations: Accompanying the letter is a two-page manuscript leaf containing Einstein's working calculations: trial expressions constraint conditions and variant formulations of the same type of semi-vector and spinor problems addressed in the letter. While we cannot confirm that these pages were originally enclosed with the letter they concern the same scientific material and have been preserved alongside it. Einstein manuscript leaves of this depth and technical significance-especially when tied to a known collaborative problem-are scarce. Significance: Whether or not originally sent together the letter and the calculations form a powerful and coherent scientific pair offering a rare view of Einstein actively working through equations testing ideas and relying on Mayer to verify mathematical structure. They capture Einstein at a critical inflection point in both his scientific life and personal circumstances as he prepared to leave Germany forever. --------- The letter from Einstein to Mayer reads in full translated from the original German: Dear Mr. Mayer! I believe I see a new possibility which promises success. It is along the lines of the recently devised way according to which one places zero on the right side of the Dirac-Equations. The novelty is in the fact that the constants a1 . a4 aside from a totally irrelevant factor are completely known without passing on to the specific Semi-Vectors. After omission of the _-terms the equations read Ee st ys = s 1 xe Or for De-Broglie-Equations of the restless particle E4 st ys = s 1a x4 Here is what's new: How does one choose the ay so that the De Broglie - Choices stay largely undetermined Result: The four equations 1a reduce themselves into a single one when and only when if one lets a1 = 1 a2 = 1 a3 = 1 a4 = 1 I believe that with this selection ay is for the equation describing the _-terms 1 the fitting substitute for the DeBroglie-Equation. These equations are already supplied by the simplest Hamilton function. See if the general equations 1 degenerate with this placing for a as well. If this were the case the whole thing would be useless. I leave on Saturday. A letter that is sent to Antwerp to the `Oakland' Hapag Antwerp harbor will reach me until December 13. Cordial greetings from your A. E. Autograph Letter Signed Written in German. One page 8.5 x 11 in.; 216 x 279 mm. probably Caputh near Potsdam Germany the location of Einstein's country home Sunday 4 December 1932. Scattered spotting affecting four words; usual folds. WITH: Two-page leaf of mathematical calculations. Housed together in decorated half-leather box by noted book artist Sjoerd Hofstra. np unknown
1912ref. 3056np: np 1912. first edition. custom box. Very Good. ON THE ROAD TO RELATIVITY: A four-panel working bifolium from Einstein's early post-Minkowski tensor phase. A remarkable working sheet showing Einstein making tensor formalism physically operational for continuum mechanics. Across three working zones the manuscript moves from a formal four-dimensional tensor transformation identity written in a distinct unidentified hand to Einstein's own derivations involving Volumenkraft Druckkraft stress force density diagrammatic testing and a heavily underlined mechanical equilibrium result. The folded rotated format gives the sheet the character of a compact notebook in miniature: formal tensor language brought into contact with physical terms local force relations diagrams and repeated calculation. The manuscript's all-lower-index notation explicit summations in Einstein's hand mixed coordinate idiom second-hand tensor identity and visible effort to make tensor language mechanically operational point most naturally to the 1912-1913 Zurich tensor period when Einstein was absorbing the post-Minkowski mathematics that General Relativity would require. Later revisitations cannot be entirely excluded but they explain the sheet less naturally. A rare survival documenting Einstein's working method on one of the foundational matter-side problems on the road to General Relativity. EINSTEIN ALBERT. Autograph scientific manuscript unsigned and undated most plausibly 1912-1913. A four-panel working bifolium 330 × 210 mm open from Einstein's early post-Minkowski tensor period retained among his private research papers and annotated by Helen Dukas: "A.E.'s Handwriting H.D." Provenance: Sotheby's New York 26 June 1998; Jagdish Mehra. PLEASE CLICK ON THE LINK BENEATH THE IMAGES FOR A PDF CONTAINING THE FULL DESCRIPTION. np unknown
