KASH3 Ref - Valuation

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| ### Function Valuation ( elt-rng^ser f ) -> elt-ord^rat ### Description The degree of the first non-zero term of the series f. ### Examples x_psr:=PowerSeriesRing(Z); x_p:=Element(x_psr,[0,0,2,1]); Valuation(x_p);
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