Knowing that the square of the variable x is denoted as square_pos(x), how is the cube of x denoted. And the variable x is greater than or equal to 0.

if `x`

is a variable or affine (as opposed to a convex expression) , `square_pos(x)`

is not needed, and `x^2`

can be used.

Similarly, if `x`

is a variable or affine, `x^3`

can be used. if `x`

is a convex expression, `pow_pos(x,3)`

can be used.

Note that `square_pos(x)`

and `pow_pos(x,3)`

are not the same as `x^2`

and `x^3`

, because the output for negative arguments is zero.