When x > 0, y > 0, the definite integral converges and becomes a function of x and y . This is called the B function. There is a relationship between this and the Γ function: If n is a positive integer, then Γ( n ) = ( n - 1)! This can be shown by performing partial integration n times on the right-hand side of (2). This and (3) result in the following for positive integers m and n : Here, n C k is the binomial coefficient. Even if x and y are complex numbers, if Re x > 0, Re y > 0 (Re x is the real part of x ), the integral on the right-hand side of equation (1) converges and Β ( x , y ) is defined. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
x>0,y>0なるとき,定積分,は収束し,xとyの関数となる。これをΒ関数という。これとΓ関数,との間には,なる関係がある。nが正の整数ならば,Γ(n)=(n-1)!となることは,(2)の右辺で部分積分をn回行って示される。このことと(3)により,正の整数m,nに対して,が成立する。ここでnCkは二項係数である。x,yが複素数であってもRex>0,Rey>0(Rexはxの実数部分)ならば,(1)式の右辺の積分が収束して,Β(x,y)が定義される。
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