Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. The state or quality of being equinumerous.
Etymologies
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Examples

Before moving ahead to the discussion of this principle, the reader should convince him  or herself of the following four facts: (1) that the material equivalence of two concepts implies their equinumerosity, (2) that equinumerosity is reflexive, (3) that equinumerosity is symmetric, and (4) that equinumerosity is transitive.

In this example, no relation R can satisfy the definition of equinumerosity.

The proofs of these facts, in each case, require the identification of a relation that is a witness to the relevant equinumerosity claim.

In order to state the definition of equinumerosity, we shall employ the wellknown logical notion ˜there exists a unique x such that Ï (x)™.

The definition of equinumerosity, or of the existence of a one to one mapping between two classes, also called

From here the step is not far to Dedekind's view that equipollence is a sufficient condition for equinumerosity.
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