Full text: Barrow, Isaac: Lectiones Opticæ & Geometricæ

Qad curvam AN H ordinetur Q δ, hæc etiam maxima erit; unde
de radicum limitibus fiet judicium; ut in iis, quæ ad ſeriem octavam
ſunt adnotata.

96. Series duodecima

Fig. 217

_a_ - _b_ + {_cc_/_a_} = _n_.

_aa_ - _ba_ + _cc_ = _nn_.

_a 3 _ - _baa_ + _cca_ = _n 3 _.

_a 4 _ - _ba 3 _ + _ccaa_ = _n 4 _, & c.

97. Series decima tertia

_b_ - _a_ - {_cc_/_a_} = _n_.

_ba_ - _aa_ - _cc_ = _nn_.

_baa_ - _a 3 _ - _cca_ = _n 3 _.

_ba 3 _ - _a 4 _ - _ccaa_=_n 4 _, & c.

Pro his, Sit AB=_b_; & AC = _c_; & angulus. AB S ſemire-
ctus, & G ξ ad AB utcunque perpendicularis, & AG . AC : : AC. ξ K; & KH KI K _byperbola aſymptotis_ SA , SB deſcripta; denuò
curvæ CLHLILλ, AMHMIMμ, ANHNINν tales ſint, ut inter AG,
GK ſit _media_ GL , _bimedia_ GM , _trimedia_ GN .

97.1.

Fig. 217.

98. Not.

1. Curvæ CLH, AMH, ANH, atque curvæ IL λ, IM μ,
IN ν ad ſeriem duodecimam ſpectant, verùm intermediæ curvæ HLI,
HMI, HNI ad decimam tertiam.

2. Curvæ CLH, IL λ ſunt _hyperbolæ æquilateræ_, quarum com-
mune _centrum_ O (rectam AB biſecans) & _ſemiaxis_ OH (vel OI)
= √ AO q. - AC q reliquæ tales ſunt, quales figura monſtrat.

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