Last Updated
：2025/12/03
formal power series
Noun
Japanese Meaning
数学（代数学）において、formal power series（形式的冪級数）とは、係数が数であり、xに具体的な値は代入されない前提で、a₀ + a₁x + a₂x² + … という形の有限または無限の級数を指す。
（ plural ）
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(mathematics, algebra) Any finite or infinite series of the form a_0+a_1x+a_2x²…=∑ᵢa_ixⁱ, where the aᵢ are numbers, but it is understood that no value is assigned to x.
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formal power series
A formal power series, like a_0 + a_1 x + a_2 x2 + ···, is studied algebraically without assigning any value to x.
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A formal power series, like a_0 + a_1 x + a_2 x2 + ···, is studied algebraically without assigning any value to x.
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