In a broad sense, it refers to the solution of Bessel's differential equation (Equation 1), and in a narrow sense, it refers to the function J(/n)(x) defined by one of them (Equation 2). Here, Γ(n+r+1) is the gamma function, and if n+r is an integer in (Equation 3), then Γ(n+r+1)=(n+r)! . Because Bessel's differential equation has a wide range of applications in physics and engineering, Bessel functions have also been calculated in detail and compiled into tables. Source : Heibonsha Encyclopedia About MyPedia Information |
広義には,ベッセルの微分方程式(式1)の解をいい,狭義にはその一つ(式2)で定義される関数J(/n)(x)をいう。ここでΓ(n+r+1)はガンマ関数で,(式3)n+rが整数ならΓ(n+r+1)=(n+r)!。ベッセルの微分方程式は物理学,工学で応用が広いため,ベッセル関数も詳しく数値計算され数表に作られている。
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