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Principia mathematica, vol. 1 (of 3)

*61. THE SUB-RELATIONS OF A GIVEN RELATION.

Project Gutenberg EPUB3 edition Whitehead, Alfred North and Russell, Bertrand
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The analogue of *60·61 is not given, because we have no suitable notation for expressing it.

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

*60. THE SUB-CLASSES OF A GIVEN CLASS. *62. THE RELATION OF MEMBERSHIP OF A CLASS.