Wolfao said:

A would like play with The Finite Element Method

Could you elaborate on what The finite element method is or provide an example.
Posted on 2002-08-31 13:46:08 by IwasTitan
Who knows why sin(x)/x is not integrable but sin(sqrt(x))/sqrt(x) is integrable?
Are there some interesting un-integrable functions you know?
Posted on 2004-09-07 13:25:50 by inFinie
Who knows why sin(x)/x is not integrable but sin(sqrt(x))/sqrt(x) is integrable?
Let u = sqrt(x)

So, sin(sqrt(x))/sqrt(x) = sin(u)/u
Posted on 2004-09-07 17:27:12 by Kestrel
Incomplete substitution...

It should be

S sin(sqrt(x))/sqrt(x) dx = S sin (u) / u * 2 u du
= S 2 sin u
= - 2 cos u + C
= - 2 cos sqrt(u) + C

Where S is the integral notation.

Anyway it is one of the standard form. Would be overkill to use integration by substitution to solve it.
Posted on 2004-09-07 20:46:53 by roticv
I will like to see one forum about math ;) and a little implementation.

Anyway, problems to solve and to implement will be nice, the only sugestion that I have, is find a free programm for draw equations, graphs and suchs, instead of use the called ascii art. Do you know one?
Posted on 2004-09-08 08:07:39 by rea