Representations of Power Series over Word Algebras
نویسندگان
چکیده
Introduction Let X be a set and X * := [ t≥0 X t are words over X , a semigroup with the concatenation operation (v , w) → vw, neutral element. Definition Let K be a field. A power series f ∈ K X * is a formal sum f = X w ∈X * fw w (fw ∈ K).
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