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# Title: Leibniz-Handschriften zur Mathematik LH 35, 12, 1
# Folio 127r, page id 00068194:0253
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Hac quoque semper observanda in calculo nostro differentiali
ut si sit (X y) = X y aequ d xy scriben
do semper priorem formulam (xy) in qua litera (X)
est major fiet calculo X + de, Y + dy n = xy
aequ dxu seu aequ. (Xy) + X dy + ydx = xy
nam dxdu semper omittitur Ergo dxus aeq ndus ydx
A si alculum differentialem velimus convertere in sumtma
torem adhuc alia observatione Nimpe opus ut tam X
quam y sumantur a minimo usque ad maximum
maximono quae
os
usque
vatios
. Ita in fig.  patet esse
ydx + (X dus aequ. xy seu
BC + AC D aequ. ABCD
in fig. D etiam verum esse
Sydx + sx dy aequ. xy nam
sx dus est quantitas negativa
qua scribi potest
dy. Ergo fiet:
Ax - 5X dys vgo X)
ABCE- EDCago
CD. p
intellig
ae
pade
utem
ide ultimis
et y. hina ga
ultimum y c
infinite varvum
equ.0
dx s
sit X
deraliter
S
ax kay
equ. Xy
Seu EA195
E
Seaqu Gt
+