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Principia mathematica, vol. 1 (of 3)

*71. ONE-MANY, MANY-ONE, AND ONE-ONE RELATIONS.

Project Gutenberg EPUB3 edition Whitehead, Alfred North and Russell, Bertrand
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This proposition is very important; it exhibits the connection of descriptive functions with one-many relations.
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This proposition is constantly used in the sequel.

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

*70. RELATIONS WHOSE CLASSES OF REFERENTS AND OF RELATA BELONG TO GIVEN CLASSES. *72. MISCELLANEOUS PROPOSITIONS CONCERNING ONE-MANY, MANY-ONE, AND ONE-ONE RELATIONS.