Primitive notion: Difference between revisions

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An inevitable regress to primitive notions in the [[theory of knowledge]] was explained by [[Gilbert de B. Robinson]]:
:To a non-mathematician it often comes as a surprise that it is impossible to define explicitly all the terms which are used. This is not a superficial problem but lies at the root of all knowledge; it is necessary to begin somewhere, and to make progress one must clearly state those elements and relations which are undefined and those properties which are taken for granted.<ref>[[Gilbert de B. Robinson]] (1959) ''Foundations of Geometry'', 4th editioned., pagep. 8, [[University of Toronto Press]]</ref>
 
==Examples==