[Maxima] newbie question about ev();

[ugur guney]

# Hi!
# This term I took a Linux course and so discovered the Maxima. Many thanks
to developers!
# Here's my question: I want to evaluate an expression which consists of
other expressions. For example:

u: x+y;
x: m^2;
y: m*n;

ev(u);
# gives m n + m^2. But, as I understand correctly, because u does depend on
m and n implicity, ev(u, m=1); does not work. It's output is same as ev(u);
# What should I do to overcome this problem? Thanks.
-ugur guney-
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