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An Elementary Course in Synthetic Projective Geometry

An Elementary Course in Sy…

Derrick Norman Lehmer
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1. Definition of one-to-one correspondence. Given any two sets of individuals, if it is possible to set up such a correspondence between the two sets that to any individual in one set corresponds one and only one individual in the other, then the two sets are said to be in one-to-one correspondence with each other. This notion, simple as it is, is of fundamental importance in all branches of science.
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