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Robinson goes on to provide a specific double recursive function (originally defined by
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is not primitive recursive. In fact, this is precisely the function now known as the
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which allows the definition of non-primitive recursive functions like the
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54:) double recursive with respect to
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252:"Recursion and Double Recursion"
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354:Computability theory
226:Primitive recursion
36:Raphael M. Robinson
26:primitive recursion
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296:mathematical logic
231:Ackermann function
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