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

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156429ET HYPERBOLÆ QUADRATURA. omnes ſeriei convergentis terminationem eodem modo eſſe
compoſitam
ex terminis convergentibus primis quo ex termi-
nis
convergentibus ſecundis, tertiis, vel quartis, &
c.
PROP. XI. THEOREMA.
Dico ſectorem circuli, ellipſeos vel hyperbolæ A B I P
11TAB. XLIII.
Fig
. 1. 2. 3.
non eſſe compoſitum analyticè à triangulo
A
B P &
trapezio A B F P.
Ponatur triangulum A B P a & trapezium A B F P b: ma-
nifeſtum
eſt ex prædictis trapezium A B I P eſſe Vqab &

polygonum
A B D L P {2 ab/a + Vqab}, item ſectorem A B I P eſſe
hujus
ſeriei convergentis terminationem.
ut ex ſeriei termi-
nis
auferantur ſigna radicis &
fractionis, pro a & b primis
ſeriei
terminis convergentibus, hoc eſt pro triangulo A B P
&
trapezio A B F P ponantur a3 + a2 b & ab2 + b3; erunt-
que
ſecundi ſeriei termini convergentes, hoc eſt trapezium
A
B I P &
polygonum A B D L P, ba2 + b2 a & 2 b 2 a, di-
co
ſeriei convergentis (cujus primi termini convergentes ſunt
a
3 + a2b, ab2 + b3 &
ſecundi ſunt ba2 + b2 a, 2 b2 a) termina-
tionem
non eſſe compoſitam analyticè a terminis a3 + a2 b,
ab
2 + b3:
ſi enim componatur prædicta terminatio analyticè a
terminis
convergentibus a3 + a2b, ab2 + b3;
componetur etiam
eadem
terminatio analyticè &
eodem omnino modo à termi-
nis
convergentibus ba2 + b2a, 2b2a;
& proinde eadem quan-
titas
, nempe prædicta terminatio, eodem modo componitur
analyticè
ex terminis a3 + a2b, ab2 + b3, quo componitur ex
terminis
ba2 + b2a, 2b2a,
22
a
3 + a2b # ab2 + b3.
ba
2 + b2 a # 2b2a
ſed nulla quantitas poteſt
eodem
modo analyticè com-
poni
ex terminis a3 + a2b,
ab
2 + b3, quo componitur
ex
terminis ba2 + b2a, 2b2a, quod ſic demonſtro.
ſi analy-
ticè
componeretur quantitas ex terminis a3 + a2b, ab2 + b3

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