Alvarus, Thomas
,
Liber de triplici motu
,
1509
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Tertii tractatus
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193
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ſui ſubiecti quã b. in c. proportione partium, et in d.
<
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ꝓportione intenſionū illaꝝ denſitatū ſimul: igitur
<
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plus denoīat a. quã b. ſuū ſubiectū in proportione
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q̄ adequate cõponitur ex proportione c. partiū et d.
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intenſionū illaꝝ dēſitatum: quod fuit probandum.</
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<
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<
s
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xml:space
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<
s
xml:id
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N22E68
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xml:space
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">Si intenſior denſi
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tas parti extendatur minori: et remiſſior maiori: ſit
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equalis ꝓportio partiū ad inuicē: et etiã denſita-
<
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tum: tunc ille denſitates equaliter ad totius deno-
<
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minationē faciūt. </
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<
s
xml:id
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N22E73
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xml:space
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preserve
">Exemplū / vt ſi in vna medietate
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ponatur denſitas vt .4. et in vna quarta vt .8. quia
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tunc inter partes et inter denſitates eſt proportio
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dupla. </
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<
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N22E7C
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xml:space
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">Ideo tm̄ adequate facit ad denoīationē to-
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tius ſubiecti denſitas vt .8. in vna quarta quantuꝫ
<
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/>
denſitas vt .4. in vna medietate: q2 vtra facit vt
<
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duo vt ptꝫ calculanti et aſpicienti attentius. </
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>
<
s
xml:id
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N22E85
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xml:space
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preserve
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batur tñ generaliter / et ſit a. denſitas intenſior per
<
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minorē partē extenſa et b. remiſſior extenſa ꝑ ma-
<
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/>
iorē partē, et ſit f. ꝓportio inter illas partes et etiã
<
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/>
ſi .f. proportio inter illas denſitates a .b. / tunc dico
<
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/>
b. deuſitas equaliter denoīat totū ſuū ſubiectuꝫ
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/>
cū ipſa a. denſitate. </
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<
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xml:id
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N22E94
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xml:space
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preserve
">Quod ſic argr̄ / ſi a. dēſitas exi
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ſtens in minori parte quã b. eſſet equalis in gradu
<
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/>
ipſi b. tunc in f. ꝓportione minꝰ denoīaret totum ̄
<
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/>
b. modo denoīat / vt ptꝫ clare ex ſecūda parte prime
<
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/>
ꝓpoſitionis: ſed modo in f. ꝓportiõe plus denoīat
<
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/>
quã tunc: q2 in f. ꝓportione eſt intenſior ceteris pa-
<
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ribus: igitur modo tantū denominat ſicut b. / quod
<
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fuit probandum.</
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<
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xml:space
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">Quinta ꝓpoſitio. </
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>
<
s
xml:id
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N22EA9
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xml:space
="
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">Si intenſior denſi
<
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/>
tas parti ſubiecti extendatur minori, et remiſſior
<
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/>
maiori parti eiuſdē ſubiecti īhereat, et ꝓportio in-
<
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/>
tenſionū illaꝝ deuſitatū excedat ꝓportionē partiū
<
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/>
tunc denſitas exiſtēs in miuore parte ſubiecti ipſū
<
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/>
totū ſubiectū denſius denoīabit ꝙ̄ denſitas exiſtēs
<
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/>
in maiori parte in ea ꝓportione ꝑ quã ꝓportio in-
<
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tenſionū illaꝝ denſitatū excedit ꝓportionē partiū
<
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/>
in quibus ſunt ille denſitates. </
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>
<
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N22EBC
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xml:space
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preserve
">Exemplū / vt ſi in vna
<
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medietate pedalis ponatur denſitas vt duo, et in
<
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/>
quarta eiuſdē denſitas vt .8. q2 ꝓportio partiū ex-
<
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/>
ceditur a ꝓportione quadrupla illaꝝ denſitatum
<
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/>
et quadrupla ex duplã per duplã. </
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<
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xml:id
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N22EC7
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xml:space
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preserve
">Ideo in du-
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plo plus denoīat denſitas vt .8. quã denſitas vt .2.
<
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/>
illud totale ſubiectū denoīet q2 illa vt .2. denoīat
<
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/>
vt vnū, alia vero vt .8. denoīat vt .2. / vt ptꝫ calculã-
<
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/>
ti. </
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>
<
s
xml:id
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N22ED2
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xml:space
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preserve
">Probat̄̄ tñ vniuerſaliter ſit a. denſitas intēſior
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b. vero remiſſior exiſtens in maiore parte ſubiecti
<
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/>
quã a. ſit ꝓportio partiū c. ꝓportio vero intenſi-
<
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/>
onū illaꝝ denſitatū d. q̄ ſit maior et excedãt d. ꝓpor
<
lb
/>
tio ipſam c. ꝓportionē ꝑ f. ꝓportionē: tunc a. denſi-
<
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/>
tas denoīat ſubiectū in f. ꝓportiõe denſius quã b.
<
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</
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<
s
xml:id
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N22EE0
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xml:space
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">Quod ſic argr̄ / q2 ſi ꝓportio intenſionū illaꝝ den-
<
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ſitatū eſſet equalis ꝓportioni c. illaꝝ partiū ſubie
<
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/>
cti: tūc eq̈liṫ a. faceret ad totius ſubiecti denoīatio
<
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/>
nē / vt pꝫ ex preredenti ꝓportione ſed modo a. eſt iu
<
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/>
f. ꝓportione intenſior denſitas quam tunc / g̊ modo
<
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/>
in f. ꝓportione plus facit ad totius denoīationem
<
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/>
̄ tunc: et ꝑ ↄ̨ñs in f. ꝓportiõe modo plus facit ̄
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b. / quod fuit ꝓbandū </
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<
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xml:space
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">Ptꝫ ↄ̨ña / q2 tm̄ facit b. modo
<
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ſicut tunc a. / vt ptꝫ. </
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>
<
s
xml:id
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N22EF6
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xml:space
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">Q, vero a. denſitas ſit nunc in f.
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ꝓportione intenſior / ꝙ̄ tunc ptꝫ per hanc maximã.
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</
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<
s
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xml:space
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preserve
">Quãdo due ꝓportiones ſunt equales ad hoc
<
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vna illaꝝ excedat alterã per f. proportionē requiri
<
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/>
tur numerus maior acquirat illã f. ꝓportionē ſu
<
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/>
pra ſe, ſi numerus minor debet manere inuariatus /
<
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vt ptꝫ facile in numeris: et ſic ptꝫ propoſitio.</
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>
</
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<
p
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<
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xml:space
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">Sexta ꝓpoſitio. </
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<
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xml:space
="
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">Ubicū maior den
<
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chead
="
Capitulū primū.
"/>
ſitas parti ſubiecti minori inheret, et remiſſior den
<
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/>
ſitas maiori parti, eſt inter partes maior ꝓpor-
<
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/>
tio quã inter illaꝝ denſitatū intenſiones: tunc den
<
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ſitas remiſſior plus facit ad totius denoīationem
<
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/>
quã intenſior in ea proportione per quã proportio
<
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/>
partiū ꝓportionē denſitatū exuperat. </
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>
<
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xml:space
="
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">Exemplum
<
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eſt facile. </
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>
<
s
xml:id
="
N22F20
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xml:space
="
preserve
">Probat̄̄ hec ꝓpoſitio generaliter / ſit a.
<
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/>
denſitas intenſior ī minore parte exiſtēs, b. vero re
<
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/>
miſſior in maiore parte exiſtēs et ſi proportio par
<
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/>
tiū c, et denſitatū d. et c. proportio partium excedat
<
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/>
d. ꝓportionē denſitatū per f. / tunc argr̄ ſic / ſi ꝓpor-
<
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/>
tio partiū puta partis maioris ad partē minoreꝫ
<
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/>
diminueretur per f. ꝓportionē tūc b. denſitas equa
<
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/>
liter denoīaret totū ſicut a. denſitas: ſed modo eſt
<
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/>
in parte in f. ꝓportioue maiore quã tunc eſſet cete-
<
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/>
ris paribus: g̊ modo in f. ꝓportione b. plus deno-
<
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minat quã tuuc: et per cõſequēs modo in f. ꝓportiõe
<
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b. plus denoīat totū ſubiectū quã a. denſitas. </
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<
s
xml:id
="
N22F39
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xml:space
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">Ptꝫ
<
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cõſequētia / q2 denoīatio qua modo denoīat a. den
<
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ſitas, et qua tunc denoīaret b. dēſitas ſunt equales
<
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/>
</
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>
<
s
xml:id
="
N22F41
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xml:space
="
preserve
">Q, o tunc b. equaliter denoīaret cū ipſa a. denſi-
<
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tate ptꝫ ex quarta ꝓpoſitione. </
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>
<
s
xml:id
="
N22F46
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xml:space
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preserve
">Et ſic ptꝫ / in ea ꝓ-
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portione denſitas remiſſior plus facit ad denoīa-
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tionē totius per quam proportio partium excedit
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ꝓportionē denſitatū / quod fuit ꝓbandū.
<
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right
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xlink:label
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note-0193-01
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xml:id
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N22F6C
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xml:space
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preserve
">2. pars q̄
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ſtionis.</
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</
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<
s
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xml:space
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">¶ Abſolu
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tis notabilibꝰ, prima parte huiꝰ q̄ſtionis expedi
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ta: reſtat ad ſecundã partē ſiue articulū huiꝰ q̄ſtio-
<
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nis accedere qui articulus cõcluſionibus quibuſdã
<
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ex p̄dictis ꝓpoſitonibus ſequentibꝰ accõmodatur
<
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</
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<
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xml:id
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N22F60
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xml:space
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preserve
">His em̄ ſequētibꝰ cõcluſionibꝰ p̄ſentis q̄ſtionis dif
<
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ficultas notatur at abſoluitur. </
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<
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xml:space
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">Sit igitur.</
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</
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<
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<
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">Prima concluſio. </
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<
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N22F78
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xml:space
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">Diuiſo aliquo cor-
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pore benſo per partes ꝓportionales quauis pro-
<
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portione, et prima pars ꝓportionalis ſit aliquali
<
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/>
ter denſa, et ſecūda in duplo plus, et tertia in triplo
<
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/>
plus ꝙ̄ prima, et ſic in infinitū: tunc totū corpus eſt
<
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/>
denſus prima parte ꝓportionali in ea ꝓportione
<
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/>
qua ſe hꝫ totū ſic diuiſum ad primã partē eiꝰ ꝓpor
<
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/>
tionalē. </
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>
<
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xml:id
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N22F89
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xml:space
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">Ptꝫ hec cõcluſio ex ꝓbatione ſecūde cõclu
<
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ſionis tertii capitis ſecūdi tractatus huius tertie
<
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/>
partis vbi et ꝓbationē et exemplū eiꝰ īueniens.
<
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xlink:href
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note-0193-02a
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xlink:label
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note-0193-02
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xml:id
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xml:space
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preserve
">1. correĺ.</
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>
</
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<
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xml:space
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">¶ Ex
<
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hac cõcluſione ſequitur primo / ſi aliquod corpus
<
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diuidatur ꝓportione tripla, et prima pars ꝓpor-
<
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/>
tionalis eiꝰ ſit aliquantulū denſa, et ſecūda in du-
<
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/>
plo, et tertia in triplo quã prima, et ſic cõſequenter:
<
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tunc totum eſt in ſexquialtero denſius prima parte
<
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</
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<
s
xml:id
="
N22FA3
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xml:space
="
preserve
">Et ſi diuidatur corpus ꝓportione quadrupla: totū
<
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eſt denſius prima parte proportionali in ſexq̇ter-
<
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tio. </
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>
<
s
xml:id
="
N22FAA
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xml:space
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preserve
">et ſi proportiõe quītupla: totū erit denſius pri-
<
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ma parte proportionali in ꝓportione ſexquiquar
<
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ta. </
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>
<
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xml:id
="
N22FB1
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xml:space
="
preserve
">Et ſi in proportiõe ſextupla: in proportiõe ſexq̇-
<
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quīta. </
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>
<
s
xml:id
="
N22FB6
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xml:space
="
preserve
">Et fi proportiõe ſeptupla: in proportiõe ſex-
<
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quiſexta: et ſic cõſequēter ꝓcedendo per ſpecies pro
<
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/>
portionis multiplicis ſuperparticularis. </
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>
<
s
xml:id
="
N22FBD
"
xml:space
="
preserve
">Proba
<
lb
/>
tur hoc longū correlariū / q2 corpus diuiſum ꝓpor-
<
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/>
tione tripla ſe hꝫ ad primã partē proportionalem
<
lb
/>
eiꝰ in proportiõe ſexq̇altera: et diuiſum proportiõe
<
lb
/>
quadrupla in proportiõe ſexq̇tertia: et diuiſum quī
<
lb
/>
tupla ſe hꝫ ad primã partē proportiõalē in propor
<
lb
/>
tione ſexquiquarta / et ſic cõſequēter / vt ptꝫ ex prima
<
lb
/>
parte huiꝰ operis capitulo quīto et ſexto: igr̄ in ca-
<
lb
/>
ſu correlarii ſequit̄̄ / ſi diuidat̄̄ proportiõe tripla
<
lb
/>
ipſum erit denſius prima parte proportionali in
<
lb
/>
ſexquialtero, et ſi quadrupla in proportione ſexq̇-
<
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/>
tertia, et ſi quītupla in ſexquiquarta, et ſic cõſequē-
<
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/>
ter. </
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>
<
s
xml:id
="
N22FD8
"
xml:space
="
preserve
">Ptꝫ hec cõſequentia per cõcluſionē precedentē
<
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/>
<
note
position
="
right
"
xlink:href
="
note-0193-03a
"
xlink:label
="
note-0193-03
"
xml:id
="
N230EF
"
xml:space
="
preserve
">2. correĺ.</
note
>
</
s
>
<
s
xml:id
="
N22FE2
"
xml:space
="
preserve
">¶ Sequit̄̄ ſecundo / ſi diuidat̄̄ corpus per partes
<
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/>
proportionales proportiõe dupla, diſtribuatur </
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>
</
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