Alvarus, Thomas
,
Liber de triplici motu
,
1509
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Secundi tractatus
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tempus velocius: iã nūc reſtat velocitateꝫ motus
<
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difformis quo ad tempus et quo ad ſubiectū ſimul
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itidē motus mixti inquiramus ſolito per more diſ
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putatiue ꝓcedētes. </
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<
s
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N20663
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xml:space
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preserve
">¶ Queritur ergo penes qḋ tan-
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̄ penes effectum motus difformis quo ad tempus
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et ſubiectū ſimul necnõ motus mixti velocitas atten
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di habeat. </
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<
s
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xml:space
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">an vcꝫ motꝰ difformis quo ad tp̄s et ſub-
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iectū ſimul velocitas menſurari debeat penes lineã
<
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/>
deſcriptam mediante velocitate vniformi ad quaꝫ
<
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talis velocitas difformis reduci habet: et an motus
<
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mixti velocitas attendi habeat penes ſpacium com
<
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/>
poſitum ex ſpaciis ꝑtranſitis mediantibus pluri-
<
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/>
bus motibus quibus ſimul moueatur mobile motū
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motu mixti.</
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<
s
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xml:space
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">Et arguitur primo / velocitas motꝰ
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difformis quo ad tempus et ſubiectum ſimul nõ at
<
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tendi habeat penes lineam deſcriptam etc. </
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>
<
s
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xml:space
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">Quia ſi
<
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/>
ſic ſequeretur / adequata velocitas talis motꝰ mē
<
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/>
ſuranda eēt penes reductionē ad vniformitatē: ſed
<
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/>
ↄ̨ñs eſt falſum / igitur illud ex quo ſequitur /. </
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<
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">Seque-
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la patet et arguitur falſitas conſequentis. </
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<
s
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N20693
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xml:space
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">quia tūc
<
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ſequeretur / ſi vna rota inciperet moueri circulari
<
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/>
ter cõtinuo vniformiter intendo motū ſuū a gradu
<
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/>
quarto vſ ad octauū in hora adequate: tunc talis
<
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/>
rota in tota illa hora moueretur adequate veloci-
<
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/>
tate vt ſex tranſeundo ſpaciū natū abſolui a veloci
<
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/>
tate vt .6. in hora adeq̈te: ſed ↄ̨ñs eſt falſū / igitur il-
<
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lud ex quo ſequitur /. </
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">Sequela ptꝫ / q2 tota illa veloci
<
lb
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tas q̄ (vt conſtat) eſt vniformiter difformis a quar-
<
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/>
to vſ ad octauum correſpondet motui vniformi vt
<
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6. ex ſupradictis </
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<
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">Falſitas conſequentis probatur:
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q2 tunc ſequeretur / ſi illa rota ſic incipiens moue
<
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/>
ri vniformiter difformiter cõtinuo vniformiter in-
<
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/>
tendendo motum ſuum a quarto vſ ad octauū cõ
<
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/>
tinuo etiã rarefieret per illam horam: ipſa adeq̈te
<
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/>
moueretur etiã velocitate vt .6. / ſed conſequens ē fal
<
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ſum / igitur illud ex quo ſequitur /. </
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<
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">Sequela patet / q2
<
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ille motus vt ponitur eſt vniformiter difformis a q̈r
<
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/>
to vſ ad octauū: et velocitas vniformis cui correſ
<
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/>
pondet eſt vt .6. / ergo ſi illa rota mouetur vniformi
<
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/>
ter difformiter continuo ī illa hora: a quarto vſ
<
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ad octauum: ipſa adequate in illa hora mouetur ve
<
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/>
locitate vt .6. </
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">Sed iam ꝓbo falſitatem conſequētis /
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/>
q2 ſi illa rota nõ rarefieret ſed ſoluꝫ moueretur mo
<
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/>
tu circulari vniformiter difformi in illa hora a q̈r-
<
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/>
to vſ ad octauū ſine rarefactione: tūc ipſa moue-
<
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/>
ret̄̄ ī illa hora adeq̈te velocitate vt .6.: ſed addita il-
<
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/>
la rarefactiõe ipſa mouet̄̄ velociꝰ ꝙ̄ tūc: igr̄ ī illo ca
<
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/>
ſu quo rarefit ipſa mouet̄̄ maiori velocitate ꝙ̄ ſit ve
<
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/>
locitas vt .6. </
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<
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xml:space
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">Cõſequentia patet ex ſe et arguitur mi
<
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/>
nor / q2 ex ſuperius dictis velocitas totiꝰ illius rote
<
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/>
attendi hꝫ cõtinuo penes pūctū mediū vel ſūmū. </
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<
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pūtus medius et ſūmꝰ in tota hora adequate ꝑ mo-
<
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tū circularē quo mouet̄̄ a q̈rto vſ ad octauum per
<
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tranſit tm̄ ſpaciū ac ſi nõ rarefieret: et in ſuꝑ ꝑ motū
<
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/>
rarefactionis pertranſiuit illud ſpaciū ꝑ qḋ plꝰ di
<
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/>
ſtat a centro illiꝰ rote ꝙ̄ diſtabat a prīcipio illiꝰ mo
<
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/>
tus: igr̄ maius ſpaciū ꝑtrãſit qñ rarefit ꝙ̄ qñ nõ ra
<
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refit / quod fuit probandum.
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">Dicitur.</
note
>
</
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<
s
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xml:space
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">¶ Dices et bene ad ar-
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gumentum concedendo ſequelam et negando falſi-
<
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tatem conſequentis. </
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>
<
s
xml:id
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N20700
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xml:space
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preserve
">et ad ꝓbationem concedo ſeq̄-
<
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lam et nego iterum falſitatem conſequentis: et cū ꝓ-
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batur nego ſequelam: vlꝫ ſi illa rota ſic incipiēs
<
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moueri vniformiter difformiter continuo vniformi
<
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ter intendendo motum ſuum et ipſa adequate mo-
<
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ueretur etiam velocitate vt ſex. </
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xml:space
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">Et ratio eſt / quia il-
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la rota mouetur duplici motu per vtrū deſcriben
<
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/>
do ſpacium: puta motu circulari vel quodammodo
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Capitulum quartum
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habente naturam motus circularis (quia continuo
<
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/>
mouetur ſuper eodem axe quamuis non proprie li
<
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/>
neam circularem deſcribat / vt ſuperius dictum eſt)
<
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et inſuper mouetur punctus a cuius velocitate deb3
<
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ſumi totalis velocitas ipſius rote motu rarefactio
<
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nis continuo recedendo a centro </
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<
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N20721
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">Quare velocitas
<
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illius puncti et ex conſequenti ipſius rote debet cõ-
<
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menſurari penes lineam aggregatam ex linea quã
<
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/>
deſcriberet ille punctus ſecluſa rarefactione: et pe-
<
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nes lineam breuiſſimam per quam plus diſtat a cē
<
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tro ꝙ̄ ante rarefactionem diſtabat.</
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<
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xml:space
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">Sed contra / quia tunc ſequeretur /
<
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ſi rota b. inciperet moueri circulariter puncto eius
<
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/>
medio a cuius velocitate (vt ſuppono) debet com-
<
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/>
menſurari totalis rote velocitas mouēte in prima
<
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/>
parte proportionali hore proportiune quadrupla
<
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/>
diuiſe velocitate vt quatuor et in ſecunda in duplo
<
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velocius: et in tertia in duplo velocius ꝙ̄ in ſecun-
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da: et ſic conſequenter: et cum hoc in qualibet parte
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proportionali illa rota vniformiter rarefieret tali
<
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ter ille punctus medius in qualibet parte ꝓpor-
<
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tionali acquireret pedalem diſtanttam a centro ſu
<
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pra diſtantiam habitam: tunc ipſa rota in illa ho-
<
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ra adequate finite deſcriberet ad lineam deſcriptam
<
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in prima parte proportionali: ſecundum conſequens eſt
<
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falſum / igitur illud ex quo ſequitur: </
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>
<
s
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xml:space
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">Sequela patet
<
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ex primo correlario ſeptime concluſionis preceden
<
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/>
tis capitis: et falſitas conſeqnentis probatur quia
<
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/>
punctus ille a cuius velocitate debet ſumi veloci-
<
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tas totius rote infinitam lineam deſcribit in illa
<
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hora. </
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<
s
xml:id
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xml:space
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">ergo ſequitur / non pertranſit in totali ho-
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ra duplum ſpacium adequate ad ſpacium ꝑirã-
<
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ſitum in prima parte proportionali: </
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<
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">Antecedens
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probatur / quia ille punctus deſcribit lineam in illa
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hora qua magis diſtat a centro per pedale ꝙ̄ an-
<
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/>
tea: et per bipedale ꝙ̄ antea: et per quadrupedale:
<
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/>
et ſic in infinitum: cum ex caſu in qualibet parte pro
<
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/>
portionali deſcribit pedalem diſtantiam per rare
<
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/>
factionem recedendo a centro. </
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>
<
s
xml:id
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N2077B
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xml:space
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">igitur ille punctus ī-
<
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finitam lineam deſcribit in illa hora / quod fuit pro
<
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/>
bandum.</
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>
</
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N20782
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<
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xml:id
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N20783
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xml:space
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">Secundo principaliter contra ſecun
<
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dam partem queſtionis arguitur ſic. </
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<
s
xml:id
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N20788
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xml:space
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preserve
">quia ſi illa
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pars eſſet vera ſequeretur / aliquod mobile in ali
<
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/>
quo tempore continuo remitteret motum ſuum pro
<
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/>
prium vſ ad non gradum: et tamen continuo in eo
<
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/>
dem tempore velocius et velocius ſpacium pertran
<
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/>
ſiret: ſed hoc videtur implicare / igitur illud ex quo
<
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/>
ſequitur. </
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>
<
s
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="
N20797
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">Sequela probatur. </
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>
<
s
xml:id
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N2079A
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xml:space
="
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">et pono / ſortes mo-
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ueatur in aliqua naui verſus eandem differentiam
<
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/>
verſus quam mouetur nauis ab aliquo gradu: con
<
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/>
tiuuo remittendo motum ſuum vſ ad non gradū
<
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/>
ipſa naue continuo intendente motum ſuum ab eo
<
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deꝫ gradu velocius ꝙ̄ ſortes remittat. </
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<
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N207A7
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preserve
">Quo poſito
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ſortes continuo remittit motuꝫ ſuum et hoc vſ ad
<
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/>
non gradum: et tamen continuo in eodem tempore
<
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/>
velocius et velocius ſpacium pertranſit: quod fuit
<
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/>
probandum: igitur propoſitum. </
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>
<
s
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">Maior patet ex ca
<
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ſu et minor probatur. </
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<
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N207B7
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xml:space
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preserve
">quia continuo velocitas mix-
<
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/>
ta ſiue compoſita ex velocitate propria qua moue-
<
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/>
tur ſortes et ex velocitate ipſins nauis eſt maior et
<
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/>
maior cum continuo maiorem velocitatem acqui-
<
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/>
rit ꝙ̄ deperdit ex caſu: igitur continuo ſortes velo-
<
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/>
cius et velocius ſpacium pertranſit / quod fuit pro-
<
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/>
bandum.
<
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xml:id
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xml:space
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">Dicitur.</
note
>
</
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<
s
xml:id
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N207CB
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xml:space
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">¶ Dices et bene concedendo ſequelam.</
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</
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<
p
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<
s
xml:id
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N207D9
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xml:space
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preserve
">Nec hoc eſt inconueniens quando mobile mouetur
<
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/>
motu mixto ex motu proprio et motu lationis.</
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