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Directory:Jon Awbrey/Papers/Peirce's 1870 Logic Of Relatives (view source)
Revision as of 17:16, 20 April 2009
, 17:16, 20 April 2009→Commentary Note 12
===Commentary Note 12===
===Commentary Note 12===
Let us make a few preliminary observations about the "logical sign of involution", as Peirce uses it here:
Let us make a few preliminary observations about the operation of ''logical involution", as Peirce introduces it here:
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<p>I shall take involution in such a sense that <math>x^y\!</math> will denote everything which is an <math>x\!</math> for every individual of <math>y.\!</math></p>
<p>I shall take involution in such a sense that ''x''<sup>''y''</sup> will denote everything which is an ''x'' for every individual of ''y''.</p>
<p>Thus</p>
<p>Thus</p>
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<p>will be a lover of every woman.</p>
<p>will be a lover of every woman.</p>
<p>(C.S. Peirce, CP 3.77).</p>
<p>(Peirce, CP 3.77).</p>
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