Moshe Yardi in CACM vol.55, n.3, march/2012. Definitions of algorithms as an abstract state machine or a recursor. Which is analogous to the argument about imperative versus functional languages. Yardi end: "An algorithm is both an abstract state machine and a recursor, and neither view by itself fully describes what an algorithm is. This algorithmic duality seems to be a fundamental principle of computer science."
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