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Bolyai, J. Absolute Geometry. Edited by J. Frischauf. Leipzig: Teubner, 1872. XII, 96 pp. - ╔Bound with: Niedermüller, H.╗ Lagrange’s Elementary Mathematical Lectures. German separate edition. Ibid. 1880. 2 leaves, 116 pp. - ╔Donadt, A.╗ The Mathematical Problem of Space and the Geometric Axioms. Leipzig, Barth 1881. 68 pp. Contemporary half-leather (library binding). I. Dibner 116 note. Cf. Horblit 69 b; Norman Coll. 942 and DSB II, 271. Rare first German edition. - Janos Bolyai’s essay on non-Euclidean space. The Latin original, Bolyai’s only work published during his lifetime, appeared in 1832 as an appendix to the tentamen of his father, Farkas. This German edition was prepared by the Graz-based mathematician, astronomer, and alpinist Johannes von Frischauf (1837–1924), known for his extension of Gauss’s trigonometric measurements and a theory of map design he developed. - Handwritten entry on the title page
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