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.

A would like play with The Finite Element Method

Could you elaborate on what The finite element method is or provide an example.

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?

Are there some interesting un-integrable functions you know?

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

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.

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.

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?

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?