Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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<
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<
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- _cca_ = _n_
<
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.</
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<
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- _ccaa_ = _n_
<
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.</
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<
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<
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in qua AC = _c_; </
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AG (vel GZ). </
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<
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">per K, intra angulum DAR
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deſcribatur _hyperbola_ KYK; </
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<
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">tum ſint curvæ CLYHLλ, AMYHMμ,
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ANYHN ν
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tales, ut inter AG (vel GZ) & </
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<
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_bimedia_ GM, _trimedia_ GN; </
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<
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<
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">Conſtat hoc, ut in præcedente; </
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<
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">quo pacto radices reſpectivè
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determinantur. </
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<
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<
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<
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liquæ HL λ, HM μ, HN ν ad ſextam.</
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<
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<
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<
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_dus._</
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<
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eſt maxima; </
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<
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erit PV maxima(unde radicum una ſemper major eſt quam √{ACq/3}
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altera minor) in quarto ſi AQ = √{ACq/4} = {AC/2}, & </
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erit QX maxima (unde radicum una major erit, altera minor ipsâ
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{AC/2}).</
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