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Principia mathematica, vol. 1 (of 3)

*72. MISCELLANEOUS PROPOSITIONS CONCERNING ONE-MANY, MANY-ONE, AND ONE-ONE RELATIONS.

Project Gutenberg EPUB3 edition Whitehead, Alfred North and Russell, Bertrand
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This proposition applies to a great many of the relations we have to deal with, for example , , , , , , , etc.
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In *72·16 below, has the meaning defined in *40·01, and does not represent a variable proposition. Similarly s in *72·161 has the meaning defined in *40·02.

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Principia mathematica, vol. 1 (of 3), Project Gutenberg eBook #78050

*71. ONE-MANY, MANY-ONE, AND ONE-ONE RELATIONS. *73. SIMILARITY OF CLASSES.