Mathematics.- Hilbert (David) "Über die Darstellung definiter Formen als Summe von Formenquadraten", in Mathematische Annalen, vol.32, pp.342-350, Leipzig, 1888; vol.72 and 95 of the same journal (3)

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Mathematics.- Hilbert (David) "Über die Darstellung definiter Formen als Summe von Formenquadraten", vol.32, (pp.342-350), some light scattered spotting, second f. repaired at gutter, library half cloth, Leipzig, 1888; "Begründung der kinetischen Gastheorie" vol. 73, (pp.562-577), library half roan, backstrip defective with tape repairs, Leipzig, 1912; "Über das Unenliche", vol.95, (pp.161-190) library buckram, Berlin, 1926, in Mathematische Annalen, the odd light stains, ex-library copies with bookplate and ink-stamps to titles, paper labels pasted to spines, some wear to extremities, 8vo (3) *** The first mentioned is considered a major turning point in algebra and real analysis; it shows a definite quadratic form can always be expressed as a sum of squares, initiating a deep reflection on polynomial representations. It is the foundational text of what would later become the 17th Hilbert Problem. It is also one of Hilbert's first international publications, when he was only 26 years old. Other important articles of notes in these 3 journals include: Adolf Hurwitz "Über diejenigen algebraischen Gebilde, welche eindeutige Transformationen in sich zulassen" (vol.32) Lucien Godeaux "Sur les surfaces algébriques dont les courbes canoniques sont elliptiques doubles" (vol.72) mile Borel "Sur un probl me de probabilités relatives aux fractions continues (vol.72) Werner Heisenberg "Über quantentheoritsche Kinematik und Mechanik" (vol.95) Norbert Wiener "The Operational Calculus" (vo

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