Viviani, Vincenzo, De maximis et minimis, geometrica divinatio : in qvintvm Conicorvm Apollonii Pergaei

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8763
THEOR. XV. PROP. XXXIV.
Si à puncto, quod eſt in Hyperbola ducatur recta linea alteri
aſymptoton æquidiſtans, ipſa, ac ſectio, quæ inter has parallelas
intercipitur, in infinitum productę ſunt infra occurſum ſemper ma-
gis recedentes, ſed tamen nunquam perueniunt ad interuallum
æquale cuidam dato interuallo;
dum earum diſtantia metiatur per
interceptas æquidiſtantes cuilibet rectæ, quæ ducta ſit ex occurſu
vtramque aſymptoton ſecans.
SIt Hyperbole ABC, cuius aſymptoti ED, EF, ſitque ex quolibet ſectio-
nis puncto B recta BGN alteri aſymptoto ED æquidiſtans, quæ intra
lectionẽ cadens, in nullo alio pũcto quam
57[Figure 57] B cum ipſa conueniet.
Dico primùm (ſi 11Coroll.
11. huius.
B ducatur quæcunque HBF vtranq;
aſym-
ptoton ſecans) ipſam, &
ſectionem IAM
infra BI eſſe sẽper magis inter ſerecedẽtes.
Applicentur quotcunque DAG, LMN
infra HB, ipſi æquidiſtantes:
patet has om-
nes LN, DG, HB inter ſe æquales eſſe, ſed
eſt DA minor HI, ergo AG maior 2210. h. IB, eſtque LM minor DA, quare &
MN
maior AG, &
hoc ſemper ſi in infinitum
producantur;
ergo linea BGN, & ſectio
IAM ſunt ſemper ſimul recedentes.
Quod
primò, &
c.
Et quoniam earum interuallum, per eaſ-
dem interceptas metitum, ſemper minus
eſt HB interuallo parallelarum BN, HL,
cum ſit GA minos GD, NM minos NL, &

omnes GD, NL, &
c. ipſi BH equales: qua-
propter, licet huiuſmodi lineæ ſint ſemper magis recedentes, non tamen
perueniunt ad interuallum æquale interuallo BH.
Quod erat tandem, & c.

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