Cavalieri, Buonaventura
,
Geometria indivisibilibvs continvorvm : noua quadam ratione promota
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ergo, SM, æquidiſtans ipſi, TP, regulæ homologarum figurę, A
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T, veluti, RK, æquidiſtat ipſi, NL, regulæ homologarum figu-
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ræ, F N, & </
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<
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">ſecant incidentes, BP, HL, ſimiliter ad eandem par-
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tem in punctis, M, K, ergo ipſæ, SV, RI, erunt homologę di-
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ctarum figurarum ſimilium, & </
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<
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">ęqualium, quę ideò erunt æquales,
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ſicut etiam ipſæ, VM, IK. </
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<
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">& </
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<
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xml:space
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">ſunt ęquidiſtantes, ergo eas iungen-
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tes erunt ęquales, & </
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<
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xml:space
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">ęquidiſtantes, ſcilicet, SR, VI, MK, eſtau-
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tem, MK, parallela, & </
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<
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xml:space
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">ęqualis ipſi, PL, ergo, SR, VI, erunt
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ęquales, & </
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<
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xml:space
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<
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xml:space
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">Eodem pacto per, EG, extendentes
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planum ęquidiſtans plano, TL, quod ſecet figurarum, AT, FN,
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productarum plana in rectis, QE, DG, oſtendemus ipſas, QO, D
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C, eſſe homologas figurarum ſimilium, & </
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<
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xml:space
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">ęqualium, AT, FN, & </
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ideò eas eſſe ęquales, vt & </
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<
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xml:space
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">ipſas, OE, CG, ergo ſi iungantur, QD,
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OC, iſtę erunt ęquales, & </
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<
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<
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liter in cæteris planis procedemus, quæ inter plana, TL, AH, ip-
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ſis æquidiſtantia ducuntur, oſtendentes, quæ iungunt extrema ho-
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mologarum earundem figurarum, AT, FN, eſſe æquales, & </
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diſtantesipſi, PL, ſi igitur, PL, regula ſtatuatur, erunt omnes di-
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ctæ iungentes in ſuperficie quadam, per quam ipſi, PL, properan-
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te quadam recta linea æquali ſemper ęquidiſtanter, eiuſdem extrema
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note
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iugiter manent in ambitu ſigurarum, AT, FN, ergo hæc erit ſu-
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perficies cylindrici, cuius oppoſitę baſes erunt ipſę, AT, FN, ſunt
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igitur, AT, FN, cylindrici cuiuſdam (nempè cuius latus eſt quod-
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uis ipſorum, QD, SR, VI, OC,) oppoſirę baſes, quod erat no-
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bis oſtendendum.</
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ci, eſt vnicus vertex conicireſpectu eiuſdem baſis.</
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nici, ABD, in reuolutione, quę ab eo fit per circuitum baſis, BD,
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ſit, A. </
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BD, reſpectu baſis, BD. </
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<
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ctum, A, ductum planum ęquidiſtans baſi, dico
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hoc planum tantummodo in hoc puncto tangere
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conicum, ſi enim poſſibile eſt eundem tangat, ſeu
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ſecet in duobus punctis, vt in, C, A, iuncta ergo,
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AC, illa erit in ſuperficie coniculari, & </
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ſcendat à puncto, A, per ipſum tranſiet aliquando
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latus conici, vt, AB, igitur, AB, erit in plano ducto per, A, </
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