Wei_Dai comments on Be careful with thought experiments - Less Wrong

6 Post author: lukeprog 18 May 2012 09:54AM

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Comment author: Wei_Dai 18 May 2012 11:08:42PM 4 points [-]

Circles and straight lines, yes, but any abstract idea of shape in general

How might one know, a priori, that "What is a circle?" is a valid question to ask, but not "What is a shape?"