Last Updated:2025/12/03

(mathematical analysis) Given a power series f(x)=∑ₙ₌₀ ᪲a_nxⁿ that is convergent for real x in the open interval (0, 1), the value lim _(x→1⁻)∑ₙ₌₀ ᪲a_nxⁿ, which is assigned to f(1)=∑ₙ₌₀ ᪲a_n by the Abel summation method (or A-method).

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Abel sum

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Abel sum

Noun
Japanese Meaning
Abel和(エイベルわ):数学解析における和の定義の一種。具体的には、冪級数 f(x)=∑ₙ₌₀∞ aₙxⁿ が (0,1) の区間で収束するとき、x→1⁻ の極限 limₓ→1⁻∑ₙ₌₀∞ aₙ xⁿ により f(1) が定義される手法を指す。
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