Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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in quarto _a_ + {_cc_/4_a_}&</
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<
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">quæ tamen inæqualitas eo minor eſt, quò
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AE (vel _n_) major exiſtit.</
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<
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<
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/_a_
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}.</
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<
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& </
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<
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">eaſdem adhibendo curvas LXL, MXM, NXN; </
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rum proprietas eſt, ut rectâ GK ductâ ad AH utcunque perpendicu-
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lari, ſit GL = {_nn_/AG}; </
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/AGq}; </
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/AGcub}.</
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">Nam ſi fiat angulus HAR ſemirectus, & </
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ad AH perpendicularis; </
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ſymptotos AD, AR deſcribatur _hyperbola_ OO; </
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ſitis lineis LXL, MXM, NXN interſectiones, radices _a_ reſpectivas
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determinabunt; </
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laribus; </
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= _n_
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