手工推导阿克曼函数
因為m很小,所以我們可以針對0≤m≤3來對阿克曼函數進行推導對于阿克曼函數的具體推導過程如下:
當m=0時:
A(0,n)=n+1
當m=1時:
A(1,n)=A(0,A(1,n-1))=A(1,n-1)+1
? ? ? =A(0,A(1,n-2))+1=A(1,n-2)+2
? ? ? =A(0,A(1,n-3))+2=A(1,n-3)+3
? ? ? ......
? ? ? =A(1,0)+n
? ? ? =A(0,1)+n
? ? ? =2+n
當m=2時:
A(2,n)=A(1,A(2,n-1))=A(2,n-1)+2
? ? ? =A(1,A(2,n-2))+2=A(2,n-2)+2+2
? ? ? =A(1,A(2,n-3))+2*2=A(2,n-3)+2+2+2
? ? ? ......
? ? ? =A(2,0)+2*n
? ? ? =A(1,1)+2*n
? ? ? =3+2*n
當m=3時:
A(3,n)=A(2,A(3,n-1))=A(3,n-1)*2+3
? ? ? =A(2,A(3,n-2))*2+3=(A(3,n-2)*2+3)*2+3
? ? ? =A(2,A(3,n-3))*2*2+3*2+3=(A(3,n-3)*2+3)*2*2+3*2+3
? ? ? =A(3,n-3)*2*2*2+3*2*2+3*2+3
? ? ? ......
? ? ? =A(3,0)*2^n+3(2^n-1)
? ? ? =A(2,1)*2^n+3(2^n-1)
? ? ? =(3+2*n)*2^n+3(2^n-1)
? ? ? =2^(n+3)-3?
總結
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