Spherical function

Japanese: 球関数 - きゅうかんすう(英語表記)spherical function
Spherical function
Also known as spherical harmonic functions. The solution to Laplace's differential equation Δ U = 0, a homogeneous polynomial of degree n (where n is 0 or a positive integer), U n ( x , y , z ), can be expressed using spherical coordinates as follows. The on the right-hand side of this equation is called an nth -order spherical function. When t = cos θ, this can be expressed as an nth -order Legendre polynomial with respect to t or its associated function, and the trigonometric function of .

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
球面調和関数ともいう。ラプラスの微分方程式 ΔU=0 の解で,n 次 ( n は0または正の整数) の同次多項式であるもの Un(xyz) は,球座標 を用いて表わせば, という形になる。この右辺における を n 次の球関数という。これは t= cos θ とするとき,t に関する n 次のルジャンドルの多項式あるいはその随伴関数と, の三角関数で表現される。

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