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Define Occams razor or Ockhams razor

Occam's [or Ockham's] razor (William of Occam [or Ockham]; c. 1340): It is the suggestion that the simpler a theory is the better. When two theories forecast the phenomena to the similar accuracy, then the one that is simpler is the better one. Furthermore, additional aspects of a theory that do not lend it more influential predicting ability are needless and must be stripped away.

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