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| Description: Law of identity
(reflexivity of class equality). Theorem 6.4 of [Quine]
p. 41.
This is part of Frege's eighth axiom per Proposition 54 of [Frege1879] p. 50; see also biid 251. An early mention of this law can be found in Aristotle, Metaphysics, Z.17, 1041a10-20. (Thanks to Stefan Allan and BJ for this information.) (Contributed by NM, 21-Jun-1993.) (Revised by BJ, 14-Oct-2017.) |
| Ref | Expression |
|---|---|
| eqid |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | biid 251 |
. 2
| |
| 2 | 1 | eqriv 2619 |
1
|
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