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- Occam's razor: When faced with competing hypotheses, select the one that makes the fewest assumptions. Do not multiply entities without necessity.
- Grice's razor: A principle of parsimony that prefers conversational implications over semantic context for linguistic explanations.
- Hanlon's razor: Never attribute to malice that which can be adequately explained by stupidity.
- Hume's razor: "If the cause, assigned for any effect, be not sufficient to produce it, we must either reject that cause, or add to it such qualities as will give it a just proportion to the effect."
- Hitchens's razor: The burden of proof or onus in a debate lies with the claim-maker, and if he or she does not meet it, the opponent does not need to argue against the unfounded claim. "What can be asserted without evidence can be dismissed without evidence."
- Newton's flaming laser sword (or Alder's razor): If something cannot be settled by experiment or observation then it is not worthy of debate.
- Rand's razor: Concepts are not to be multiplied beyond necessity—the corollary of which is: nor are they to be integrated in disregard of necessity.
- Popper's falsifiability principle: For a theory to be considered scientific, it must be falsifiable
- Garg, A. (17 May 2010). "Occam's razor". A.Word.A.Day. Retrieved 2014-02-25.
- Hazlett, A. (2007). "Grice's razor". Metaphilosophy 38 (5): 669. doi:10.1111/j.1467-9973.2007.00512.x.
- "Hanlon's Razor". The Jargon File 4.4.7. Retrieved 2014-02-25.
- Miles, M. (2003). Inroads: Paths in Ancient and Modern Western Philosophy. University of Toronto Press. p. 543. ISBN 978-0802037442.
- Forrest, P. (2001). "Counting the cost of modal realism". In Preyer, G.; Siebelt, F. Reality and Humean Supervenience: Essays on the Philosophy of David Lewis. Studies in Epistemology and Cognitive Theory. Rowman & Littlefield Publishers. p. 93. ISBN 978-0742512016.
- "Rand's Razor". The Ayn Rand Lexicon. Retrieved 2015-05-30.
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