### 5.25.5 Polynomial valuation : valuation ldegree

valuation or ldegree takes as argument a polynomial given
by a symbolic expression or by the list of its coefficients.

valuation or ldegree returns the valuation of this
polynomial, that is the lowest degree of its non-zero monomials.

Input :

valuation(x`^`

3+x)

Output :

1

Input :

valuation([1,0,1,0])

Output :

1