Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica
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GEOMET. VARIA.
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per hæc quæ nunc trademus fiet, quæ jam olim, multò an-
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te iſtas literas vulgatas conſcripſimus.</
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<
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<
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xml:space
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">Præcipuum verò operæ pretium tunc fuit compendioſa hu-
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juſce regulæ contractio, quam, quoad potui, proſecutus,
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tandem in ipſas illas inſignes Huddenii, Sluſiique regulas
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deſinere inveni, quas mihi Viri hi Clariſſimi uterque ferè eo-
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dem tempore exhibuerant: </
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">an vero hac eadem viâ an aliâ in
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illas inciderint nondum mihi compertum.</
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<
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<
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xml:space
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">Sit data linea curva ut B C, quæ cognitam relationem ha-
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xml:space
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">TAB. XLV.
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fig. 2.</
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beat ad rectam aliquam poſitione datam A F; </
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<
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xml:space
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">ac proinde ap-
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plicatâ è puncto quolibet curvæ, ut B, rectâ B F, in dato
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angulo B F A, datoque in recta A F puncto A, certa æqua-
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tione relatio quæ eſt inter A F & </
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<
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">F B expreſſa habeatur. </
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empli gratiâ, appellando A F, x; </
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xml:space
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= xya - y
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, ubi a lineam quandam datam ſignificare cen-
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ſenda eſt.</
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<
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xml:space
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">Quod ſi jam ad punctum B tangens ducenda ſit B E, quæ
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occurrat rectæ A F in E, voceturque F E, z, ejus longitu-
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do per hanc regulam Fermatianæ regulæ compendiariam, in-
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venietur, ex ſola æquatione data.</
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<
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">Tranſlatis terminis omnibus æquationis datæ ad unam æqua-
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tionis partem, qui proinde æquales fiunt nihilo, multiplicen-
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tur primò termini ſinguli, in quibus reperitur y, per nume-
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rum dimenſionum quas in ipſis habet y, atque ea erit quan-
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titas dividenda. </
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multiplicentur per numerum dimenſionum quas in ipſis habet
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x, & </
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">atque hæc quantitas pro diviſo-
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re erit ſubſcribenda quantitati dividendæ jam inventæ. </
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cto habebitur quantitas æqualis z ſive F E. </
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eadem ubique retinenda ſunt; </
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<
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xml:space
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">atque etiam ſi forte quantitas di-
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viſoris, vel dividenda, vel utraque minor nihilo ſive negata ſit,
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tamen tanquam adfirmatæ ſunt conſiderandæ: </
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">hoc tantum
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obſervando, ut cum altera adfirmata eſt, altera negata, tunc
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F E ſumatur verſus punctum A, cum verò utraque vel affir-
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mata eſt vel negata, ut tunc ſumatur F E in partem contra-
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riam.</
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