Ceva, Giovanni
,
Geometria motus
,
1692
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PROP. VI. THEOR. IV.
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<
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">VT eadem recta ex fluxu puncti renouetur, opportet in
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quocunque illius puncto ſeruari priſtinas directio
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nes, </
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<
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">Cum, vti diximus, ad deſcriptionem lineæ duo tantùm
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exigantur, nempe motus, & puncti directio; motus verò po
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teſt eſſe quilibet, ſequitur ergo directionem, alteram de
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duobus, ſeruari debere. </
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Ax.
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2.
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buius.
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5.
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huius.
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DEF. II.
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<
s
id
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">LIneam dicimus curuam, in qua ſumptis duobus ad
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libitum punctis, recta, quæ ipſa puncta coniunge
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ret, nullam cum propoſita linea partem ſit habitura com
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munem. </
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PROP. VII. THEOR. V.
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<
s
id
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">DIrectiones puncti deſcribentis lineam, iuxta rectas
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lineas concipi debent. </
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<
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">Dum punctum fluere intelligimus, ineſt in eo ſingulis
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momentis certus, ac præfixus gradus velocitatis, quo tan
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tùm attento, rectà,
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abbr
="
æquabiliq;
">æquabilique</
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motu in certam partem con
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tenderet; at huiuſmodi iter, aliud non eſt, quàm directio
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puncti, qua eius temporis momento proficiſcitur; ergo iux
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ta rectas lineas, directiones omnes conſiderari opportet. </
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PROP. VIII. THEOR. VI.
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<
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id
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">TAngens, & directio motus in quouis curuæ puncto
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eſt vna,
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abbr
="
atq;
">atque</
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>
eadem recta. </
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<
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id
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">Nam in deſcriptione
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cuiuſcunq;
">cuiuſcunque</
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>
rectæ procedit pun
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