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

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[111.] III. DOMINI GREGORII RESPONSUM AD ANIMADVERSIONES DOMINI HUGENII, IN EJUS LIBRUM, DE VERA CIRCULI ET HYPERBOLÆ QUADRATURA.
[112.] PROP. X. PROBLEMA.
[113.] Tom. II. Nnn
[114.] CONSECTARIUM.
[115.] IV. EXCERPTA EX LITERIS Dni. HUGENII DE RESPONSO, QUOD Dnus. GREGORIUS DEDIT AD EXAMEN LIBRI, CUI TITULUS EST, VERA CIRCULI ET HYPERBOLÆ QUADRATURA.
[116.] V. EXCERPTA EX EPISTOLA D. JACOBI GREGORII, CONTINENTE QUASDAM EJUS CONSIDERATIO-NES, SUPER EPISTOLA D. HUGENII, IMPRESSA IN VINDICATIONEM EXAMINIS SUI LIBRI, DE VERA CIRCULI ET HY-PERBOLÆ QUADRATURA.
[117.] FINIS.
[118.] CHRISTIANI HUGENII GEOMETRICA VARIA. Tom. II. Ppp
[119.] I. CONSTRUCTIO LOCI AD HYPERBOLAM PER ASYMPTOTOS.
[120.] DEMONSTRATIO.
[121.] II. DEMONSTRATIO REGULÆ DE MAXIMIS ET MINIMIS.
[122.] Tom. II. Qqq
[123.] III. REGULA Ad inveniendas Tangentes linearum curvarum.
[124.] Tom. II. Rrr
[125.] IV. CHRISTIANI HUGENII EPISTOLA DE CURVIS QUIBUSDAM PECULIARIBUS.
[126.] V. PROBLEMA AB ERUDITIS SOLVENDUM: A JOHANNE BERNOULLIO IN ACTIS LIPSIENSIBUS ANNI MDCXCIII. PROPOSITUM.
[127.] Tom. II. Ttt
[128.] VI. C. H. Z. DE PROBLEMATE BERNOULLIANO IN ACTIS LIPSIENSIBUS PROPOSITO.
[129.] VII. C. H. Z. CONSTRUCTIO UNIVERSALIS PROBLEMATIS A CLARISSIMO VIRO JOH. BERNOULLIO PROPOSITI.
[130.] FINIS.
[131.] CHRISTIANI HUGENII OPERA ASTRONOMICA. Tomus Tertius.
[132.] Tomi tertii contenta.
[133.] CHRISTIANI HUGENII DE SATURNILUNA OBSERVATIO NOVA. Tom. III. Ttt
[134.] CHRISTIANI HUGENII DE SATURNI LUNA OBSERVATIO NOVA.
[135.] Tom. III. Vvv.
[136.] CHRISTIANI HUGENII ZULICHEMII, CONST. F. SYSTEMA SATURNIUM, SIVE DE CAUSIS MIRANDORUM SATURNI PHÆNOMENON; ET COMITE EJUS PLANETA NOVO.
[137.] SERENISSIMO PRINCIPI LEOPOLDO AB HETRURIA Chriſtianus Hugenius S.D.
[138.] Tom. III. Xxx
[139.] NICOLAUS HEINSIUS, D. F. AD AUCTOREM SYSTEMATIS.
[140.] CHRISTIANI HUGENII Zulichemii, Cθnst. F. SYSTEMA SATURNIUM.
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144417ET HYPERBOLÆ QUADRATURA.
PROP. III. THEOREMA.
Dico triangulum B A P, & trapezium A B I P ſimul,
eſſe ad trapezium A B I P, ut duplum trapezii A B I P ad polygonum A B D L P.
11TAB. XLIII.
Fig. 1. 2. 3.
In antecedente demonſtratum eſt trapezia A B F P, A B I P
ſimul, eſſe ad duplum trapezii A B I P, ſicut trapezium
A B F P ad polygonum A B D L P:
& permutando tra-
pezia A B F P, A B I P ſimul, ſunt ad trapezium A B F P,
ut duplum trapezii A B I P ad polygonum A B D L P.
&
quoniam trapezium A B F P, trapezium A B I P &
trian-
gulum A B P, ſunt continuè proportionalia;
erit trape-
zium A B I P ad trapezium A B F P, ut triangulum A B P
ad trapezium A B I P;
& componendo, ut trapezia A B I P,
A B F P ſimul, ad trapezium A B F P, ita triangulum
A B P &
trapezium A B I P ſimul, ad trapezium A B I P:
erat autem, ut trapezia A B I P, A B F P, ſimul, ad tra-
pezium A B F P, ita duplum trapezii A B I P ad polygo-
num A B D L P;
& igitur ut triangulum A B P & trape-
zium A B I P ſimul, ad trapezium A B I P, ita duplum
trapezii A B I P ad polygonum A B D L P, quod demon-
ſtrare oportuit.
Producantur (ſi opus ſit) rectæ A D, A L, ſegmentum
ſecantes in punctis E &
O, & rectas B I, I P, in H & M:
deinde jungantur rectæ B E, E I, I O, O P, ut complea-
tur polygonum A B E I O P.
PROP. IV. THEOREMA.
Dico polygonum A B E I O P eſſe medium pro-
portionale inter polygonum A B D L & trapezium A B I P.
22TAB. XLIII.
Fig. 1. 2. 3.
Ex hujus prima manifeſtum eſt trapezium A I L P, tra-
pezium A I O P &
triangulum A I P eſſe

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