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5.64.2  List of variables: lname indets

lname (or indets) takes as argument an expression.
lname (or indets) returns the list of the symbolic variable names used in this expression.
Input:

lname(x*y*sin(x))

Output:

[x,y]

Input:

a:=2;assume(b>0);assume(c=3);
lname(a*x^2+b*x+c)

Output:

[x,b,c]

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