From1930'sonKleenemorethananyothermathematiciandevelopedthenotionsofcomputabilityandeffectiveprocessinalltheirformsbothabstractandconcrete,bothmathematicalandphilosophical.
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From 1930's on Kleene more than any other mathematician developed the notions of computability and effective process in all their forms both abstract and concrete, both mathematical and philosophical.