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

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218488CHRIST. HUGENII torum differentia eſt {{1/4}ggoo/pp} - ox + {ppxx/gg} - yy + 2 ly - ll
+ {2nxy/z} + {2lnx/z} - {nnxx/zz}.
Ergo hæc æquatur rectangulo
Y
S X, hoc eſt quadrato I X minus quadrato I S, hoc eſt
{{1/4}ggoo/pp} - mm;
quia I X = {{1/2}go/p} & I S = m. In qua æqua-
tione
deleto utrinque {{1/4}ggoo/pp}, invenietur y = l - {nx/z} +
√mm
- ox + {ppxx/gg} , ut oportebat.
Sit tertius caſus quo habeatur - mm, ſitque æquatio y = l
-
{nx/z} + √- mm + ox + {ppxx/gg} , producta GN occurrat al-
teri
aſymptoto in D.
Hîc jam eadem ratione qua prius, ap-
parebit
L O vel LQ eſſe {{1/2}go/p} + {px/g}, &
L C = y + {nx/z} - l.
Et propter hyperbolam erit rectangulum Q C O = rectan-
gulo
D N G ſeu quadrato N G, hoc eſt {{1/4}ggoo/pp} + mm, quia
X
I = {{1/2}go/p}, &
I S = m, quorum quadratis æquale fecimus
quadratum
G N.
Rectangulum autem Q C O æquatur qua-
drato
L O minus quadrato L C, hoceſt {{1/4}ggoo/pp} + ox + {ppxx/gg}
-
yy - {2nxy/z} {nnxx/zz} + 2 ly + {2nlx/z} - ll.
Ergo hoc
æquale
{{1/4}ggoo/pp} + mm.
In qua æquatione deleto rurſus

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