Huygens, Christiaan, Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica

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PROP. VI. THEOREMATA.
Dico differentiam inter triangulum A B P & trape-
11TAB. XLIII.
Fig
. 1. 2. 3.
zium A B F P majorem eſſe duplo differentiæ inter
trapezium
A B I P &
polygonum A B D L P.
Sit triangulum A B P, A; trapezium A B F P, B; tra-
pezium
A B I P, C, &
polygonum A B D L P, D: quo-
niam
A eſt ad C ut C ad B, igitur ut differentia inter A
&
C ad A, ita differentia inter C & B ad C; & permutan-
do
, ut differentia inter A &
C ad differentiam inter C & B
ita
A ad C;
& componendo, ut differentia inter A & C &
differentia
inter C &
B ſimul, hoc eſt differentia inter A &
B
, ad differentiam inter C &
B, ita A + C ad C; ſed ut
A
+ C ad C ita 2 C ad D, &
ideo differentia inter A &
B
eſt ad differentiam inter C &
B ut 2 C ad D. quoniam
A
+ C eſt ad C ut 2 C ad D, erit permutando ut A + C
ad
2 C ita C ad D;
& dividendo, ut differentia inter A &
C
ad 2 C ita differentia inter C &
D ad D; & permutan-
do
, differentia inter A &
C eſt ad differentiam inter C & D
ut
2 C ad D;
ſed demonſtratum eſt differentiam inter A &
B
eſſe ad differentiam inter C &
B ut 2 C ad D; & proin-
de
differentia inter A &
B eſt ad differentiam inter C & B,
ut
differentia inter A &
C ad differentiam inter C & D; ſed
differentia
inter A &
B eſt major differentia inter C & B,
&
ideo differentia inter A & C eſt major differentia inter C
&
D: & prædictam analogiam permutando, differentia in-
ter
A &
B eſt ad differentiam inter A & C, ut differentia
inter
C &
B ad differentiam inter C & D; at differentia in-
ter
A &
B eſt major differentia inter A & C, & ideo diffe-
rentia
inter C &
B eſt major differentia inter C & D; atque
differentia
inter A &
B æqualis eſt differentiis, inter A & C,
inter
C &
B; cumque earum utravis ſit major differentia

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