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# Title: Leibniz-Handschriften zur Mathematik LH 35, 12, 1
# Folio 137r, page id 00068194:0273
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aequatio fundamentalis ex defini
tione progressionis harmonicae 
Z = a + 2b  Zb
a Fb.
Za a +2ba +b= 2b.
2a125, - a + 2b = 7 b.
2a 12b = Zb + a + 2bs
2a + 2 - 71 = 4 
Za = a + 2b
a + b
a + 2b
a + b
c
= a + 3b +  + 2b 
a + 3b
(1115 (ed
e-
+ 2b
a
2)) duabus
Datis differen.
tirs proessio
1- a+ 2b = b
1= a + ab + 
nis harmoniae
eerminos in
Venire.
a+b
+b
atb at
Z - aa + 2b a + b a + 2bl.
a
b
a + 3b + 2
2b+ 2b =3c+2C = C+5d+3d
a
3b +26, = b + 3C +2C