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5.29.8  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

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