Alvarus, Thomas
,
Liber de triplici motu
,
1509
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<
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De motu augmentationis.
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0216
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216
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da par queſtionis noſtre reſtat ad dubia accedamꝰ</
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</
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<
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<
s
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xml:space
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">Dubitatur primo. </
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<
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xml:space
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">An ſecundū primã
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opinionem vndecima: duodecima: et tredecima cõ-
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cluſiones calculatoris in capitulo de augmentatio
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ne ſint concedēde: et an proobationes earum quas
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ipſe calculator adduxit cõcludant et ſint efficaces.</
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</
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<
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<
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xml:space
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">Dubitatur ſecūdo / an ille eedem ſint
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concedende ſecundum poſteriorem opinionem.</
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</
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<
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<
s
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N25557
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xml:space
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preserve
">Dubitatur tertio / an iuxta ſecūdū op-
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pinionē aliquid poſſit per totum diminui.</
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<
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<
s
xml:id
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N2555D
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xml:space
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">¶ Ad primū accedendo probo primo / probatio
<
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calculatoris ad vndecimã concluſionem nõ valeat
<
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ſaltem in caſu ſuo: quia in illo caſu illa concluſio
<
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eſt falſa: igitur non probat eam in tali caſu. </
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<
s
xml:id
="
N25566
"
xml:space
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preserve
">Pro
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batur antecedēs: quia ipſe ponit caſum infinita
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incipiant augeri a non quanto: et incipiat primum
<
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in duplo velocius augeri ſecundo: et ſecundū in du-
<
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plo velocius tertio: et tertiū quarto: et ſic conſequē
<
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ter: in caſu iſta propoſito eſt falſa: in infinitum ve
<
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lociter incipit aliquod augeri quod iu infinitū tar
<
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de incipit augeri. </
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<
s
xml:id
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xml:space
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">Probatur / quia bene ſequitur in
<
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finite velociter incipit aliquod iſtoruꝫ augeri quod
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infinite tarde incipit augeri ergo poſt inſtans qḋ
<
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/>
eſt preſens infinitum velociter augebitur quod in
<
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/>
finitum tarde incipit augeri: et ꝑ cõſequēs poſt hoc
<
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/>
aliqualiter velociter aliquod iſtorum augebit̄̄ qḋ
<
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infinite tarde incipit augeri: conſequens eſt falſuꝫ /
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igitur et antecedens. </
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>
<
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xml:space
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">Conſequentie ſunt note et pro
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batur falſitas conſequentis / quia nullū infinite tar
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de incipit augeri / vt patet intuenti caſum: igitur.</
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</
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<
s
xml:id
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xml:space
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">¶ Secundo arguitur / ꝓbando inefficaciam proba
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tionis qua ipſe calculator probat duodecimã con-
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cluſionē. </
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<
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xml:space
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">Ad eam em̄ probandam inducit calcula-
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tor talem caſum ſint infinita quãta quorum primū
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ſit aliquantū: et ſecūdū in quadruplo maius ꝙ̄ pri
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mū: et tertiū in quadruplo maius ꝙ̄ ſecundū: et ſic
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in infinitū: et augeatur primū aliqualiter velociter
<
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et ſecundū in duplo minus: et tertiū in duplo minꝰ
<
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̄ ſecundū: et ſic in infinitum: tunc dicit primã par-
<
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tem concluſionis ſequi. </
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<
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xml:space
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">videlicet infinitum tarde
<
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incipit augeri quod infinitam quãtitatem incipit
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acquirere quia vt inquit: ſecundum in duplo maio
<
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rem ̄titatē acquirit ꝙ̄ primū: et tertiuꝫ ꝙ̄ ſecundū /
<
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et ſic cõſequenter. </
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>
<
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N255B3
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xml:space
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">Ad quod probãdū facit hanc cõ
<
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ſequentiã: ſi primū illorū preciſe eque velociter au-
<
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geretur ſicut ſecūdū. </
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<
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">Secundū in quadruplo velo-
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cius acquireret de quantitate quam primū: ſꝫ nūc
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in duplo velocius incipit primū acquirere de quãti
<
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tate quã tnnc: ergo in duplo velocius incipit ſcḋm
<
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acquirere de quantitate ꝙ̄ primū: et ſic tertiū in du
<
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plo velocius ſecūdo: et ſic in infinitū: et per conſe-
<
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quens ante quodcun inſtans infinita quantitas
<
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erit acquiſita alicui illorum: et ſic infinitam quan-
<
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titatem incipit aliquod illoruꝫ acquirere. </
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<
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xml:space
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">Sed hec
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ratio eſt inefficax quia conſequentia illa quã facit
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nichil valet videlicet hec. </
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<
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">Si primū eque velociter
<
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preciſe augeretur ſic ſecundū. </
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<
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">Secūdum in quadru
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plo velocius acquireret de quantitate ꝙ̄ primū: ſed
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nunc puta in caſu in duplo velocius incipit primuꝫ
<
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acquirere de quantitate quã tunc: igitur in duplo
<
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velocius incipit ſecundū acquirere de quãtitate ̄
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primum. </
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<
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">QꝪ autem illa conſequentia nichil valet:
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patet / quia illius conſequentie antecedens eſt verū
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in caſu et conſequens falſum: igitur illa nichil va-
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let. </
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<
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xml:space
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">Probaiur antecedens: et pono / in illo caſu
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primum illorum in vna hora acquirat proportio-
<
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De motu augmentationis.
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nem ſexdecuplam: et ſit illud primū vnum pedale
<
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et ſecundum in eadem hora acquirat quadruplam
<
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quod quidem ſecundum eſt quadrupedale. </
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<
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xml:space
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">quo po-
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ſito antecedens eſt verum et conſequens: igitur con
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ſequentia nulla. </
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<
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">QꝪ autem antecedens ſit verū pa-
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tet. </
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<
s
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xml:space
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">quia maior eſt neceſſaria vt conſtat et minor in
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caſu noſtro vera. </
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<
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">quia incipit in duplo maiorē pro
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portionem acquirere ꝙ̄ tunc: et continuo in duplo
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maiorem acquiret ꝙ̄ tunc: et ſic continuo in duplo
<
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maiorem quantitatem acquirit ꝙ̄ tunc: et per con-
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ſequens totum antecedens eſt verum. </
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<
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">Sed iam pro
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bo falſitatem falſitatē conſequentis quia in quoli
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bet inſtanti illius hore: primo erit acquiſita maior
<
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quantitas ꝙ̄ ſubdupla ad quantitatem acquiſitaꝫ
<
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ipſi ſecundo: igitur in nullo tali inſtanti erit acqui
<
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ſita ſecundo dupla quantitas ad quãtitateꝫ acqui
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ſitam primo: et per cõſequens non incipit in duplo
<
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velocius acquirere de quantitate ꝙ̄ primū: ex quo
<
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nunquam quantitas acquiſita ſecundo erit in du-
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plo maior quam quantitas acquiſita primo. </
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<
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iam probo / in quolibet inſtãti illius hore primo
<
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erit acquiſita maior quautitas ꝙ̄ ſubdupla ad quã
<
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titatem acquiſitam primo: quia quocun inſtanti
<
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dato ſi primū continuo eque velociter augeretur cū
<
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ſecundo ipſum primum in tali inſtanti haberet ac-
<
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quiſitam quantitatē ſubquadruplam ad quantita
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tem acquiſitam ſecundo: ſꝫ modo ſuper illã quanti
<
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tatem adhuc acquiſiuit tantam proportionem ſi-
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cut acquiſiuit tunc acquirendo illam quantitatem /
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ergo ſuper illam quantitatem acquiſitam adhuc
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acquiſiuit maioreꝫ illa acquiſita: et ꝑ ↄ̨ñs in tali
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inſtanti quantitas acquiſita eſt maior ꝙ̄ ſubdupla
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ad quantitatem acquiſitam ſecundo / quod fuit pro
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bandum. </
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<
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xml:space
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">Patet conſequentia: quia ſi preciſe acqui
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ſiuiſſet vſ ad illuod inſtans tantam proportionē
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ſicut ſecundū: et ſuper illam ſubquadruplã quanti-
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tatem acquiſitam acquiſiuiſſet adhuc tantam pre-
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ciſe: quantitas ei acquiſita manſiſſet ſubdupla ad
<
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quantitatem acquiſitam ſecundo: ſed modo in illo
<
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inſtanti ſuper illa quantitate ſubquadrupla ipſuꝫ
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primū acquirit maiorē: quia acquirit tantam pro
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portionē ſicut antea et eſt maius: ergo quãtitas ſub
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dupla ei acquiſita eſt maior ꝙ̄ ſubdupla ad quan-
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titatem acquiſitam ſecundo / qḋ fuit probandum.
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</
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<
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">Item ad probandam ſecundam partem eiuſdē cõ-
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cluſionis facit calculator talem conſequētiam. </
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<
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xml:space
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">Si
<
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primū aliquorum continuo ſe habentium in ꝓpor-
<
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tione ſubquadrupla puta quorū primū ſit vt qua-
<
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tuor et ſecundum vt vnum: tertium vt vna quarta:
<
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et ſic in infinitur eque velociter diminueretur ſicut
<
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ſecundum in quadruplo velocius deꝑderet de quã-
<
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titate quam ſecūdum: ſed nunc in duplo tardius in
<
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cipit primū deperdere de qqãtitate ꝙ̄ tunc: ergo in
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duplo velocius incipit primum deperdere de quã-
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titate ꝙ̄ ſcḋm. </
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<
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xml:space
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">Et hec cõſequentia etiaꝫ nichil valet
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quia primū ſpemper deperdit maiorem quantita-
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tem ꝙ̄ duplã ad quãtitatem deperditam a ſecundo
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</
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<
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">¶ Ad iſtud dubiū </
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<
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">Reſpondeo ponendo aliquas ꝓ
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poſitiones. </
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<
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xml:space
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">¶ Prīa propoſito. </
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<
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">Probationes vnde
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cime et duodecime concluſiõis calculatoris ſunt in
<
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efficaces. </
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<
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xml:space
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">Patet hoc ex argumentis nuꝑrime fctīs
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</
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<
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xml:space
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">¶ Secūda ꝓpoſitio </
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<
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">Ille concluſiones vndecima vi
<
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delicet et duodecima in caſibus ibi poſitis ſi ſumã
<
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tur in ſenſu cathegorico ſunt falſe. </
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>
<
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">Probatur de
<
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vndecima ex primo argumento contra dubium: de
<
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duodecima etiam probatur / ipſa in caſu ibi poſi
<
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to ſit falſa: qua nullū illorum corporum infinitam
<
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quantitatem incipit acquirere: igitur non in infi </
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