06/18/2022, 11:54 PM
(06/18/2022, 11:45 PM)Catullus Wrote:(12/16/2007, 06:02 PM)Ivars Wrote: This is called infinitesimal which is smaller than any real and is not 0.An infinitesimal is zero.
no no no.
on the real line :
[f(x + h) - f(x)]/h = f ' (x)
division by 0 is not possible.
2h =/= h
2 * 0 = 0.
1/h ( positive infinitesimal ) = +oo ( or going to it )
1/0 = undefined.
So infinitesimal is anything but 0.
limit to 0 in some sense at best.
or neighbourhood of 0 in another sense maybe.
regards
tommy1729

