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# Title: Leibniz-Handschriften zur Mathematik LH 35, 13, 2a
# Folio 113r, page id 00068197:0225
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Ad prop. 15 t. 1. Eucl.
Euclides, aut 95as sit qus demonstraois autoz, non recté videtz
propositionem hanc demonstraste, cum, postquam angulos AEd
DEB, item angulos CEB, et BED duobus rectis aequalos esse
dixit. Sic pergit: Cum 1g2 omnes rocti anguli inter sa sint
aequales; orunt duo anguli AED, DEB, duobus angulis DEB
BEC aequales. Id h. subsumit, quod ab ipso non e pbatum, se
angulos AED. DEB, et Alos DEB, BEC osse rectos ou
tantum ostenderit, cop duobus rectis esse aequales
Johannos Vagetius literis mihi significavit, cam demonstratio
nom neque Ca Ramoneque quopiam alio (sibi gdr viso) Eucli-
dis castigatore reprehendi, o tn. ab omnibus eod. modo
Pponiq
Proclum n. et ex Thione Zambertum. Ramu, tran-
oiscum Flesates Candall. Nicolaum lartalea, Dasypodiu
 Ambrosium Rhodium, postquam demonstrarunt, angulos AED
DEB; itemque DEB, BCC duobus rectis este aequales, sta
tim subjungare: igr A
c
lavius a- et ex Clavio P. de Mardele, Mathem. Galluis, cum
que his Campanus assumunt pterca illud principium, quodd oes
anguli recti sint ini se aequales, et contia idem principirem, Cl
Partus, rem ad absurdum doducens, coeludit: Angulos duobus
rectis aequilis (puta AED, DEB _ DEB, BEC ( esse inaequales
angulis duobus ractis aequalitque siidem sc.) si A ED _ C aB po
nantus inequales.
. literas agetii II Non. Sept
in 1652 Hamburgo Guosam ad me missas.