Here are some examples to illustrate syntax errors.
In this case, I made a typing error; there is an extra right
parenthesis after the "2". Removing it fixes the problem.
> y : = sqrt(4);
In this case, the problem is that the ":=" has a blank separating
the ":" and the "=".
> y := sqrt(4);
y := 2
In this case, the problem is that the variable name "by" is a word
reserved by Maple for another meaning. Here's a list of such
by do done elif else end fi for from if in local
od option options proc quit read save stop then