Existing CAS commands --> Prime discussion

[compsystems]

importance of UNQUOTE CMD, evaluate subparts of expressions.

y:=3; x:=5;
a:=quote(x+unquote(y)); [enter] returns
x+3

b:=quote(unquote(x)+y) [enter] returns
y+5

eval(a); eval(a,1); eval(a,2); [enter] returns
8, y+5, 8