Benedetti, Giovanni Battista de
,
Io. Baptistae Benedicti ... Diversarvm specvlationvm mathematicarum, et physicarum liber : quarum seriem sequens pagina indicabit ; [annotated and critiqued by Guidobaldo Del Monte]
,
1585
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IO. BAPT. BENED.
quis
,
qua
ratione
fractus
numerus
.
c
.
i
.
minor
ſit
in
ſuo
integro
.
d
.
b
.
fracto
.
a
.
i
.
in
ſuo
integro
.
a
.
b
.
aut
fracto
.
a
.
c
.
in
ſuo
integro
.
a
.
d
.
conſideret
is
quo
pacto
pro-
portio
.
c
.
i
.
ab
.
d
.
b
.
minor
ſit
proportione
.
a
.
i
.
ab
.
a
.
b
.
et
.
a
.
c
.
ab
.
a
.
d
.
hac
ratione
.
Ma-
nifeſtum
eſt
eg
prima
ſexti
de
quantitate
continua
,
aut
.18.
ſeptimi
Euclidis
de
diſcre
[Figure 2]
ta,
proportionem
ipſius
.
d
.
i
.
ab
.
d
.
b
.
eſſe
ſi-
cut
.
a
.
i
.
ab
.
a
.
b
.
&
cum
.
c
.
i
.
minor
ſit
.
d
.
i
.
velut
pars
ſuo
toto
,
proportio
,
c
.
i
.
ab
.
d
.
b
.
minor
ergo
proportione
.
d
.
i
.
ab
.
d
.
b
.
eg .8.
quinti
,
quare
minor
ergo
pariter
proportio-
ne
.
a
.
i
.
ab
.
a
.
b
.
eg
.12.
eiuſdem
vnà
etiam
pro-
portio
.
c
.
i
.
ab
.
d
.
b
.
minor
ergo
.
a
.
c
.
ab
.
a
.
d
.
eg
eiſdem
cauſis
,
medio
.
c
.
b
.
eg
quas
pa-
tet
ratio
,
cur
fracti
diuerſarum
denomina-
tionum
ab
vnicam
reducantur
.
Cur
etiam
numeros
integros
in
partes
fractis
ſimiles
frangere
liceat
,
quæ
omnia
eg
ſubſequenti
figura
facilè
cognoſci
poſſunt
.
THEOREMA
II
.
Q
Vae
ſit
ratio
,
cur
ch
,
qui
numeros
,
fractos
diuerſarum
denominationum
col-
ligere
volunt
, &
in
ſummam
redigere
,
multiplicent
vnum
eg
numerantibus
per
denominatorem
alterius
, &
poſtmodum
denominatores
adinuicem
,
quorum
vltimum
productum
,
commune
eſt
denominans
duorum
priorum
productorum
,
quæ
collecta
in
ſummam
efficiunt
quem
quærebatur
.
Qua
in
re
ſciendum
eſt
,
denominantes
conſiderari
tanquam
partes
vnius
eiuſdẽ-
q́ue
magnitudinis
quantitatis
continuæ
,
linearum
(verbigratia)
a
.
b
.
et
.
a
.
d
.
æqualium
in
longitudine
,
quarum
.
a
.
b
.
in
quatuor
partes
diuidatur
,
et
.
a
.
d
.
in
tres
.
Quare
ſi
colli-
gere
voluerimus
duo
tertia
cum
tribus
quartis
,
multiplicabimus
.
a
.
c
.
duo
tertia
,
cum
.
a
.
b
.
diuiſa
in
4.
partes
,
produceturq́ue
.
c
.
b
.
octo
partium
ſuperficialium
,
de-
hinc
multiplicando
.
a
.
i
.
tres
quartas
cum
.
a
.
d
.
diuiſa
in
.3.
partes
producetur
.
i
.
d
.
pri
mis
ſingulis
æqualis
,
nouem
partium
ſuper
ficialium,
multiplicata
deinde
a
.
b
.
diui-
[Figure 3]
ſa
in
.4.
partes
per
.
a
.
d
.
in
.3.
diuiſa
,
produ-
cetur
quadratum
.
d
.
b
.
in
continuo
,
in
12.
partes
diuiſum
,
quem
ergo
totum
commune
ſingulis
productis
,
quorum
primum
erat
.
c
.
b
.
Quare
.
c
.
b
.
ita
ſe
habet
ab
totum
.
d
.
b
.
ſi-
cut
.
a
.
c
.
ab
.
a
.
d
.
eg
prima
ſexti
in
continuis
,
aut
.18.
ſeptimi
in
diſcretis
quantitatibus
,
et
.
d
.
i
.
ab
.
d
.
b
.
ſicut
.
a
.
i
.
ab
.
a
.
b
.
eg
eiſdem
propoſitionibus
.
Collectis
deinde
parti-
bus
producti
.
c
.
b
.
cum
partibus
producti
.
d
.
i
.
manifeſtè
depræhendetur
eiuſmodi
ſummam
componi
eg
partibus
vnius
totius
communis
ſingulis
earum
.
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