In mathematics and theoretical computer science, the theory of computation encompasses the Sudan function, which is a function that is non-primitive recursive but still recursive.
Similar to the Ackermann function, it was discovered and published by a Romanian mathematician called Gabriel Sudan in the 1920s.
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F2
F2(x, y)
F2(x*y)
F2x
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Gabriel Sudan
Issac Sudan
Mathew Sudan
Micheal Sudan
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1926
1927
1928
1929
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F3
F2 (x, y)
F2 (x*y)
F2x
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X^-1
X^+1
X^-2
X^2
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1
0
-1
2
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Fn(x,y)
Fx Fx Fx Fx
F(x * y) F(x*y)
Fn
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A function of two negative integers x and y
A function of one positive integer x
A function of one negative integer y
A function of two positive integers x and y
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F0 (x,y)
F0
F0 (x*y)
F0x
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