Huygens, Christiaan, Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica

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PROP. XXIV. THEOREMA.
IIsdem poſitis; dico Z ſeu ſe-
11
A
B # A B
C
D # G H
E
F # M N
K
L # O P
Z
# X
ctorem hyperbolæ minorem eſ-
ſe
quam minor duarum mediarum
arithmeticè
continuè proportio-
nalium
inter A &
B. Inter A &
B
ſit media arithmetica G, &
in-
ter
G &
B ſit media Arithmetica
H
, Item inter G &
H ſit media Arithmetica M, & inter M
&
H ſit media Arithmetica N: continueturque hæc ſeries con-
vergens
A B, G H, M N, O P, in infinitum, ut fiat ejus termi-
natio
X.
ſatis patet ex prædictis G majorem eſſe quam C;
atque H media arithmetica inter G & B major eſt media har-
monica
inter easdem G &
B; media autem harmonica inter
G
&
B; major eſt media harmonica inter C & B, nempe D, quo-
niam
G major eſt quam C;
& ideo media Arithmetica inter G
&
B nempe H major eſt quam D media harmonica inter C & B
eodem
modo M media Arithmetica inter G &
H major eſt me-
dia
geometrica inter eaſdem G &
H; & quoniam G eſt ma-
jor
quam C &
H quam D, media geometrica inter G & H
major
eſt quam E media geometrica inter C &
D; & proin-
de
M major eſt quam E.
Deinde N media Arithmetica in-
ter
M &
H major eſt media harmonica inter easdem; & quo-
niam
H major eſt quam D &
M quam E, media harmonica
inter
M &
H major eſt quam F media harmonica inter E &
D
;
& ideo N eadem F major eſt. eodem modo utramque
ſeriem
in infinitum continuando, ſemper demonſtratur ter-
minum
quemlibet ſeriei A B, C D, minorem eſſe quam idem
numero
terminum ſeriei A B, G H;
& igitur terminatio ſe-
riei
A B, C D, nempe Z, minor erit terminatione ſeriei A

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