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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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The following proposition is used in the theory of derivatives of a series (*216·411).
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This proposition is used in the theory of derivatives of a series (*216·4) and in the theory of ordinal numbers (*251·11).
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This proposition and the next (*71·55) are very often used.

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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.