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

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[116] Fig. 5.25 Mart. 1655. * a b *
[117] Fig. 7.26 Mart. * a b *
[118] Fig. 4.
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[120] Pag. 550.TAB. XLV III.Fig. 1.* a * b 27. Mart. 1655.
[121] Fig. 2.a * 3. Apr.
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147420VERA CIRCULI fieri poſſit) generalis methodus inveniendi omnium ſerierum
convergentium terminationes.
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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