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Formal power series

generalization of a polynomial, where the number of terms is allowed to be infinite, defined algebraically without consideration of convergence (so that e.g. evaluation is not always defined)

Pronunciation
/ˈfɔrməl ˈpaʊər ˈsɪriz/
/ˈfɔːməl ˈpaʊə ˈsɪəriːz/