Hey there

I have noticed that after some time, Maple freezes and says in the bottom left corner that it is "evaluting" when I  copy something. This is becoming unbearable, as it makes every assignment take a lot longer. Why is this happening, and how can I prevent it?

So I'm running into the problem that when I use an assumption, to say automate dsolving, the solution functions I end up defining, has the 'tilde' variable in it. which doesn't seem to be redefinable. How do I get rid of the assumption, in a defined function, or alternatively, how to do I redefine the variable so the function will use it?