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

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[142] Fig. 23.* 20. Maii.
[143] Fig. 24.* c a * 27. Maii.
[144] Fig. 25.c * 31. Maii. a *
[145] Fig. 26.* 13. Iun.
[146] Fig. 27.* 16. Ian. 1656.
[147] Fig. 28.* 19. Febr.
[148] Fig. 29.* 16. Mart.
[149] Fig. 30.* 30. Mart.
[150] Fig. 31.* 18. Apr.
[151] Fig. 32.* 17. Iun.
[152] Fig. 33.* 19. Oct.
[153] Fig. 34.* 21. Oct.
[154] Fig. 35.* 9. Nov.
[155] Fig. 36.* 27. Nov.
[156] Fig. 37.* 16. Dec.
[157] Fig. 38.* 18. Ian. 1657.
[158] Fig. 39.* 29. Mart.
[159] Fig. 40.* 30. Mart.
[160] Fig. 41.* 18. Maii.
[161] Fig. 42.* 19. Maii.
[162] Fig. 43.* 17. Dec.
[163] Fig. 44.* 18. Dec.
[164] Fig. 45.* 27. Dec.
[165] Fig. 46.* 11. Mart 1658.
[166] Fig. 47.* 16. Mart.
[167] Fig. 48.* 23. Mart.
[168] Fig. 49.* 3. Apr.
[169] Fig. 50.* 10. Nov.
[170] Fig. 51.* 16. Ian. 1659.
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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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