Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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Unde etiam interſectiones Sectionum Conicarum & Curvarum ter
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tiæ poteſtatis, eo quod ſex eſſe poſſunt, ſimul prodeunt per æqua
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tiones ſex dimenſionum, & interſectiones duarum Curvarum tertiæ
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poteſtatis, quia novem eſſe poſſunt, ſimul prodeunt per æqua
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tiones dimenſionum novem. </
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>Id niſi neceſſario fieret, reducere licc
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ret Problemata omnia Solida ad Plana, & pluſquam Solida ad Soli
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da. </
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>Loquor hic de Curvis poteſtate irreducibilibus. </
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>Nam ſi æqua
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tio per quam Curva definitur, ad inferiorem poteſtatem reduci
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poſſit: Curva non erit unica, ſed ex duabus vel pluribus compoſi
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ta, quarum interſectiones per calculos diverſos ſeorſim inveniri
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poſſunt. </
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>Ad eundem modum interſectiones binæ rectarum & ſecti
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onum Conicarum prodeunt ſemper per æquationes duarum dimen
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ſionum; ternæ rectarum & Curvarum irreducibilium tertiæ poteſtatis
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per æquationes trium, quaternæ rectarum & Curvarvm irreducibi
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lium quartæ poteſtatis per æquationes dimenſionum quatuor, & ſic
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in infinitum. </
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>Ergo rectæ & Spiralis interſectiones numero infinitæ, cum
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Curva hæc ſit ſimplex & in Curvas plures irreducibilis, requirunt æ
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quationes numero dimenſionum & radicum infinitas, quibus omnes
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poſſunt ſimul exhiberi. </
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>Eſt enim eadem omnium lex & idem calculus. </
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Nam ſi a polo in rectam illam ſecantem demittatur perpendiculum,
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& perpendiculum illud una cum ſecante revolvatur circa polum, in
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terſectiones Spiralis tranſibunt in ſe mutuo, quæque prima erat ſeu
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proxima, poſt unam revolutionem ſecunda erit, poſt duas tertia,
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& ſic deinceps: nec interea mutabitur æquatio niſi pro mutata mag
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nitudine quantitatum per quas poſitio ſecantis determinatur. </
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cum quantitates illæ poſt ſingulas revolutiones redeunt ad magNI
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tudines primas, æquatio redibit ad formam primam, adeoque una
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eademque exhibebit interſectiones omnes, & propterea radices ha
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bebit numero infinitas, quibus omnes exhiberi poſſunt. </
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>Nequit
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ergo interſectio rectæ & Spiralis per æquationem finitam generali
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ter inveniri, & idcirco nulla extat Ovalis cujus area, rectis impe
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ratis abſciſſa, poſſit per talem æquationem generaliter exhiberi. </
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LIBER
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PRIMUS.</
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<
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>Eodem argumento, ſi intervallum poli & puncti, quo Spiralis de
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ſcribitur, capiatur Ovalis perimetro abſciſſæ proportionale, pro
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bari poteſt quod longitudo perimetri nequit per finitam æquatio
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nem generaliter exhiberi. </
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<
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>De Ovalibus autem hic loquor quæ non
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tanguntur a figuris conjugatis in infinitum pergentibus. </
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