I need this subs because otherwise i would loose track.

But the replies above helped me. Now I use the palette and the solve() funktion. Works pretty good.

Except this problem I like maple very much.

Thank you all for your replies!

Thank you very much for your help!

solve( eqn, v_x ) does work.

But I can not believe that such a bug can occur.

This is an elementary funktion...

I am using maple11.

For example I do:

1. 5*v_x=7

2. enter

3. right mousebutton -> 2D-Math -> convert to -> atomic identifier

4. enter

5. right mousebotton on equation -> solve -> solve for variable -> THERE STANDS: '#msub(mi("v"),mi("x"))'

when I click that - nothing happens.

where can I find this "subliteral item from the palettes"?

Hi!

Thanks for your reply!

No - I want to use "v_x"as a single Variable. Like "y" or "b". No v₁, v₂,...

What I for example want to do is:

5* v_x = 7      ----->solve for v_x