Gamma function

Japanese: Γ関数 - ガンマかんすう(英語表記)gamma function
Gamma function
An important special function in analysis. In 1929, L. Euler introduced the following infinite product for complex numbers z in relation to definite integrals. AM Legendre named this the gamma function and used the symbol Γ( z ). The above equation is identical to , but if further rewritten, it can be transformed into the following Weierstrass standard form. Here, is Euler's constant. As can be seen from the Weierstrass standard form, the Γ function has first-order poles at z = 0, -1, -2, ... and is analytical elsewhere.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
解析学で重要な特殊関数。1929年,L.オイラーは定積分に関連して,次の無限乗積を複素数zに対し導入した。これをA.M.ルジャンドルが,ガンマ関数と命名し,記号Γ(z)を用いた。上の式は,と一致するが,さらに書き直せば,次のワイヤーシュトラスの標準形に変形できる。ここに,は,オイラーの定数である。ワイヤーシュトラスの標準形からわかるように,Γ関数はz=0,-1,-2,……で1位の極をもち,その他では解析的になる。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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