Etymology

Newton's flaming laser sword

Today it means: A philosophical razor which states that propositions or claims that cannot be resolved through experiment or observation are not worth debating. Full definition →

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The story

Named after Isaac Newton. Coined by Australian mathematician and philosopher Mike Alder in 2004 in an article of the same title, to be hyperbolically “much sharper and more dangerous than Occam's razor”.

Etymology from Wiktionary, CC BY-SA 4.0.