Alvarus, Thomas
,
Liber de triplici motu
,
1509
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Secūde partis
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portio / qḋ fuit ꝓbãdū. </
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<
s
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xml:space
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">Et ſic ptꝫ ↄ̨cluſio gñaliter.</
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<
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xml:id
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xml:space
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">1. correl.
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ſcḋa ꝓṗe
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tas medi
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etatꝪ gro
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trice.</
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>
<
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<
s
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xml:space
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">¶ Ex hac concluſione ſequitur primo / conſtitu-
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tis quatuor terminis in hac medietate ſicut ag-
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gregatum ex primo et ſecundo ad ſecundū ita ag
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gregatū ex tertio et quarto ad quartū vt conſtitu
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tis his quatuor terminis .8.4.6.3. ſicut ſe habent
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8. et .4. ad .4. ita .6. et .3. ad .3. </
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<
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xml:space
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">Probatur / et ſint q̈-
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tuor termini in hac medietate geometrica ꝓpor-
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tionabiles a.b.c.d. / dico / qualis eſt ꝓportio .ab.
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ad b. talis eſt .cd. ad d. </
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<
s
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xml:space
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">Quod probatur ſic et vo
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lo / b. addatur ipſi a. et d. ipſi c. / et arguo ſic / ſicut
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ſe habet a. ad b. ita c. ad .d. / ergo b. eſt talis pars ali
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quota vel partes aliquote et eiuſdem denomina-
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tionis reſpectu a. qualis eſt d. reſpectu c. (et proce
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das a maioribus verſus minores) et b. additur ip
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ſi a. et d. ipſi .c. / igitur equalem ꝓportionem acqui
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rit a. ſupra ſe ſicut c. ſupra ſe </
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>
<
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xml:space
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">Patet conſequentia
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ex correlario vndecime ſuppoſitionis: et eandeꝫ ꝓ
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portionē quã acquiſiuit a. ſupra ſe acquiſiuit pro
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portio ipſius a. ad b. et ſimiliter eam quam acqui
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ſiuit c. ſupra ſe acquiſiuit ꝓportio ipſius c. ad d. /
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vt patet ex probatione none ſuppoſitionis / igitur
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facta tali acquiſitione qualis eſt proportio .ab.
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ad b. talis eſt .cd. ad d. / quod fuit ꝓbandum </
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>
<
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N128BA
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xml:space
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">Pa-
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tet conſequentia / quia ꝓportio a. ad b. eſt equa-
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lis proportioni c. ad d. et equalem ꝓportionem ac
<
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quirunt ille due proportiones / igitur ī fine manēt
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eq̈les / q2 ſi equalibus eq̈lia addas etc. ſꝫ in fine vna
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illaꝝ ꝓportionū ē .ab. ad .b. et alia ē .cd. ad d. / er-
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go proportio .ab. ad .b. eſt equalis ꝓportioni .cd.
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ad d. </
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<
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">Eodē mõ ꝓbabis / ſi procedas ad minoribus
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ad maiores termīos in ꝓportiõe mīoris īeq̈litatꝪ
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</
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<
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">Sed eadē hypotheſi retēta gñaliter probat̄̄ corre
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lariū ſic: et volo / a. diminuat̄̄ ad eq̈litatē b. et c. ad
<
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equalitatē d. / et ſic ꝑdēt eq̈les ꝓportiones ex hypo
<
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theſi: deiñ reſiduū ipſius a. acq̇rat ſupra ſeipſū b.
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et reſiduū c. aq̇rat ipſū d. / et manifeſtum eſt / ag-
<
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gregati ex reſiduo a. et ipſo b. ad ipſū b. et aggre
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gati ex reſiduo ipſiꝰ c. et ipſo d. ad ipſū d: eſt eq̈lis
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ꝓportio puta dupla: volo igit̄̄ / aggregatum ex
<
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reſiduo ipſius a. et ipſo b. acq̇rat illa quãtitatem
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quã deꝑdidit a. ita maneat aggregatū ex a. et b.
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et aggregatū ex reſiduo ipſius c. et ipſo d. acq̇rat
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quãtitatē quã deꝑdidit ipſū c. ita maneat in fi-
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ne aggregatū ex c. et d. / et tunc ſeq̇tur / aggregati
<
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ex a. et b. ad ip̄m b. et aggregati ex c. et d. ad ipſum
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d. ē eadē ꝓportio / qḋ fuit ꝓbãdū. </
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<
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">Probat̄̄ ↄ̨ña. </
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">q2
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illi termini añ acq̇ſitionē quãtitatū deꝑditaꝝ ab
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ipſo a. et ipſo c. / ſe hēbaut in eadē ꝓportione puta
<
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dupla / vt dictū ē: et acq̇ſiuerunt eq̈les ꝓportiones
<
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termini maiores illaꝝ ꝓportionū: igit̄̄ iter datos
<
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terminos manet eq̈lis ꝓportio: q2 ſi eq̈libꝰ eq̈lia
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addas etc </
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<
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">Probatur minor: q2 medietates illorū
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terminorū maiorū eq̈les ꝓportiões acq̇ſiuer̄t: igi
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tur et ipſi termini maiores eq̈les proportiões acq̇
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ſinerūt / vt ptꝫ ex tertia cõcluſione ſeptimi capitꝪ ṗ
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me ꝑtis: et p ↄ̨ñs proportiões quas hñt ad mīores
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terminos eq̈les proportiones acq̇ſiuerūt / vt ptꝫ ex
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ſuppoſitione huiꝰ.
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medieta
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tꝪ geome
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trice.</
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</
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</
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<
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xml:space
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">Et ſic ptꝫ correlariū / qḋ ſit medi
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etatis geometrice ſcḋa proṗetas </
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<
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">¶ Seq̇tur ſeḋo /
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in hac medietate cõſtitutis .4. termīs q̈lis ē ꝓpor-
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tio ṗmi ad m talis ē ꝓportio aggregati ex ṗmo et
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tertio ad aggregatū ex ſcḋo. et .4. vt cõſtitutis his
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terīs .12.6.4.2. q̈ĺ ē ꝓportio .12. ad .6. taĺ ē ꝓportõ
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12. et .4: ad .6. et .2. </
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<
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">Probat̄̄ / ſint .4: terī ī hac medie
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tate a.b.c.d. / et dico / ſic̈ a. ad b. ita aggregatū ex
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a. et c. ad aggregatū ex b. et d. </
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<
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">Qḋ ſic oñdit̄̄ / et .1. ī nū
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ris / et volo / a. acq̇rat c. et b. acq̇rat d. (et ꝓcedo a
<
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maioribꝰ) / et arguit̄̄ ſic ſicut ſe hꝫ a. ad b. ita c. ad d /
<
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igr̄ ꝑmutatī ex .4. ↄ̨cĺoe ſicut ſe hꝫ a. ad c. ita b. ad d /
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et ex ↄ̨ñti ſeq̇r̄ / c. ē ꝑs aliq̊ta vĺ ꝑtes reſpectu a. eiuſ
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Capitulum ſecundum
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dē denoīatiõis ſicut d. reſpectu b. vel eoↄ̈ ſi ꝓpor-
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tio a. ad c. ſit mīorꝪ īeq̈litatꝪ: et a. aq̇rit c. et b. aq̇rit d /
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igr̄ q̀lē ꝓportionē aq̇rit nūerꝰ maior hꝰ ꝓportõis q̄
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ē a. ad b. talē acq̇rit nūerꝰ mīor. </
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<
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">Cõſequētia / ptꝫ ex
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ſcḋo correlario octaue ſuppõis: g̊ ī fine facta tali
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acq̇ſitiõe manet eadē ꝓportio ſiue eq̈lis illi q̄ ē īter
<
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a: et b. / vt ptꝫ ex correlario decime ſuppõnis / et in fi
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ne manet proportio .ac. ad bd. / g̊ proportio .ac. ad
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.bd. ē equalis ꝓportioni a. ad b. / qḋ fuit probandū
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</
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<
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ſe hꝫ c. ad d. / ita ſe hꝫ aggregatū ex .ac. ad aggrega
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tū ex .bd. </
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<
s
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">Et arguo / ſic ſicut ſe hꝫ a. ad b. ita c. ad d. / g̊
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ex ↄ̨cluſione ſicut ſe hꝫ a. ad c. ita b. ad d. diminuat̄̄ /
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igr̄ a. ad equalitatē c. et b. ad equalitatē d. / et ſic ma
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nifeſtū ē / equalē ꝓportionē deꝑdūt a. et b. </
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<
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">Uolo
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igr̄ / reſiduū ex a. acq̇rat ſupra ſeipſū c. et reſiduū
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ex b. ipſū d. et tūc aggregati ex reſiduo a. et ipſo c.
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ad ipſū c. ē illa proportio q̄ ē aggregati ex r̄ſiduo
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b. et ipſo d. q2 dupla / vt ↄ̨ſtat: acq̇rat g̊ aggregatū
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ex reſiduo a. et ip̄o c. quãtitatē quã ꝑdidit a. et ag-
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gregatū ex reſiduo b: et ip̄o d. quãtitatē quã deꝑdi
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dit b. et tūc manifeſtū ē / ꝓportio aggregati ex re
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ſiduo a. et ip̄o c. ad ipſū c. et ꝓportio aggregati ex
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reſiduo b. et ipſo d. ad ipſū d. eq̈les ꝓportiones ac
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q̇rūt q2 medietates maioꝝ termīoꝝ equales ꝓpor
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tiões acq̇rūt puta illas quas antea pdiderūt et ſic
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maiores termī illaꝝ ꝓportionū eq̈les ꝓportiões
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acq̇r̄t / vt pꝫ ex tertia ↄ̨cĺoe ſeptī capitis ṗme ꝑtꝪ: igr̄
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īter illos termīos q̇ ſūt iã .ac. et c. et .bd. et b. manet
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adhuc eq̈lis ꝓportio: et ꝑ ↄ̨ñs ſicut ſe hꝫ aggrega-
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tū ex a. et c. ad ipſū c. ita ſe hꝫ aggregatū ex b. et d.
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ad ip̄m d. / igr̄ ex ↄ̨cluſione ſicut ſe hꝫ aggregatū ex
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a. et c. ad aggregatū ex b. et d. ita ſe hꝫ c. ad d. / quod
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fuit ꝓbandū. </
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<
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">Et ſolēt antiq̇ geometre et ſignanter
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calculator vti hoc correlario ſub his rermīs
<
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xml:id
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xml:space
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">eadē ē ꝓ-
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portio di
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uiſoꝝ et ↄ̨
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iūctoruꝫ.</
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>
</
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<
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lis ē ꝓportio diuiſoꝝ talis ē ↄ̨iūctoꝝ: vt ſi ſint due
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ꝓportiões duple: et cõpulet̄̄ terminꝰ maior vniꝰ cū
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termīo maiore vlteriꝰ: et mīor vniꝰ cū mīore alteri
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us īter illos termīos ſic ↄ̨iūctos manebit ꝓportio
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dupla.
<
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xlink:href
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xml:id
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xml:space
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">4. ꝓprie
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tas medi
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etatꝪ geo
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metrice</
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</
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<
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xml:space
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">¶ Seq̇tur .3. / .4. termīs in hac medietate ↄ̨
<
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ſtitutis: q̈lis ē ꝓportio ſcḋi ad ṗmū talis ē quarti
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ad tertiū vt ↄ̨ſtitutis. </
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>
<
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="
N129AD
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xml:space
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">his 4: termīs .8.4.6.3. q̈lis ē
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ꝓportio .4. ad .8. talis ē .3. ad 6. </
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>
<
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xml:id
="
N129B2
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xml:space
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">Ptꝫ hoc coreela-
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riū facile / qm̄ ſꝑ ꝓportiões mīoris īeq̈litatis ſunt
<
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eq̈les īter ſe cū ꝓportiões maioris īeq̈litatis q̇bus
<
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corrñdent īter ſe ſūt equales: et eoↄ̈. </
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>
<
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xml:id
="
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xml:space
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">Sicut eī oēs
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duple ſūt equales: ita oēs ſubduple ſūt equales: et
<
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ſic̈ oēs ſubtriple ſṫ eq̈les: ita oēs triple igr̄ vĺr ſi ta
<
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lis ꝓportio fuerit a. ad b. maioris īeq̈litatꝪ q̈lis ē
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c. ad d. ↄ̨ñs ē ꝓportio mīoris īeq̈litatꝪ d. ad c. et
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b. ad a ſint eq̈les. </
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>
<
s
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="
N129C8
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xml:space
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">Et ita ēt ꝓbaſſes ſi a. ad .b. fuiſſꝫ
<
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ꝓportio mīoris īeq̈litatꝪ. </
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>
<
s
xml:id
="
N129CD
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xml:space
="
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">Et hec ſit .4. ꝓṗetas geo
<
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metrice medietatꝪ. </
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>
<
s
xml:id
="
N129D2
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xml:space
="
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">¶ Seq̇t̄̄ .4. / diſpoſitis .4. ter-
<
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mīs ſicut ṗmꝰ et ſcḋs ad m et tertiꝰ et quartꝰ ad q̈r
<
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ita ṗmꝰ ad m et tertiꝰ ad q̈rtū / vt ↄ̨ſtitutis his .4.
<
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termīs .8.4.2.1. / q2 .8. et 4. ad .4. ē talis ꝓportio q̈
<
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lis ē .2. et .1. ad .1. / vt pꝫ ex ṗmo correlario huiꝰ ↄ̨clu
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ſionis. </
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>
<
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xml:space
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">Iõ q̈lis ē ꝓportio ṗmi ad m talis ē terti ad
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.4. / vt ↄ̨ſtat. </
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<
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">Probat̄̄ ṗmo / ī nūeris ſint .4. nūeri a.
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b.c.d. et ſicut .ab.. ad .b. ita c. ad .cd. / tūc ḋt correĺm /
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ſicut a. ad b. ita c. ad d. et ſit .a maiꝰ b. et c. maiꝰ d.
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et deꝑdat .ab:b. et .cd.d. / et arguit̄̄ ſic ſicut ſe hꝫ .ab.
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ad b. ita c.d. ad d. / igr̄ b. ē talis ꝑs aliq̊ta vel ꝑtes
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aliq̊te et eiuſdē denoīatiõis reſpectu ipſiꝰ .ab. / q̈lis
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ē d. reſpectu .cd. et .ab. ꝑdit b. et .cd. ꝑdit d. / g̊ illi duo
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nūeri maiores puta .ab. et .cd. ꝑdūt eq̈les ꝓportio
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nes / vt pꝫ ex .1. correĺ. 8. ſuppõis / g̊ ſeq̇t̄̄ / quãtã ꝓ
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portionē adeq̈te ꝑdit ꝓportio ab. ad b. tãtã ade
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q̈te ꝑdit ꝓportio .cd. ad d. / vt pꝫ ex nona ſuppoſiti
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one: et ille ꝓportões ante erãt equales / vt ponitur
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igitur mõ manēt equales: q2 ſi ab equalibus equa </
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