Elements of geometry : containing the first six books of Euclid, with a supplement on the quadrature of the circle, and the geometry of solids : to which are added, Elements of plane and spherical geometry (1826)
Playfair, John, 1748-1819, Euclid · Philadelphia : Marot & Walter · leaf 294
sistance of a new Axiom. Another attempt to demonstrate the same proposition without theassistance of a new Axiom has been made by a modern geometer,Franeeschini, Professor of Mathematics in the University of Bologna,in an essay, which he entitles, La Teoria delleparallele… … perpcndieular to BD at anypoint, RK and DE, if produc-ed will meet. To demonstratethis, it is supposed, that BO,lie are two parts taken in Bfcl,of which BC is greater thanBO and that the perpendicu-lars OiV, C L are drawn to BDjthen shall BL be greater thanBN. For, if not;, that is, if…
Euclid's Elements · Geometry · Trigonometry
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