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["Jon Schmid" <address@hidden>]

Hello,

I was wondering if anyone could tell me how I am misusing the (single quote repeated twice) ' ' operator in TeXmacs, under mathematical input mode.
For Example:

expr: diff( y(t), t, 2) - 5 * diff( y(t), t ) + 6 * y(t);

I want to check the algebra showing e^(5*x) plugged in for y(t) in 'expr' evaluates to 0.  I use an environment call to plug in e^(5*x) for the value of y(t):

ev(expr
, y(t):= %e<rsup|(5*t)> );

but this only goes as far as giving the original expr with e^(5*x) plugged in for y(t).  What I would like to see at this point is the result of the two diff() operators acting on their arguments, so that I can see the integer coefficients of e^(5*x) in all three terms, and that they add to 0.  

What should I do to the result of the ev() environment _expression_ to see these steps?  I could always just force a numeric approximation, but I'd rather understand how to control the re-evaluation/execution of the algebra in-between.

Thanks,
Jon Schmid