Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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præcedentia recto diſcurſu comprobata dedimus; </
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<
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do veritas, opinor, ſatis ſirmatur, at ejuſdem origo limpidiùs appa-
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ret. </
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<
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iſta paucula ſubdemus, quibus tales diſcurſus communiantur, quorum-
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que ſubſidio non difficilè conficiantur _Propoſitorum demonſtrationes a-_
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_pagogicœ_.</
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<
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natâ quâ piam ratione R ad S majores; </
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<
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">erit _omnium antecedentium_
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(ſimul acceptarum) ad _omnes conſequentes ratio_ major ratione
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R ad S.</
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A. X. # A. M.
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B. Y. # B. N.
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C. Z. # C. O.
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<
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">Nam ſint rationes A ad M, B ad N, C ad O ſingulæ æquales ra-
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tioni R ad S. </
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">& </
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fore A + B + C. </
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majores ſint, _antecedentium ſummam ad ſummam conſequentium_ eti-
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am deſignabili quâcunque majorem rationem habere.</
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<
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