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Mirrors > Home > MPE Home > Th. List > eqcom | Structured version Visualization version Unicode version |
Description: Commutative law for class equality. Theorem 6.5 of [Quine] p. 41. (Contributed by NM, 26-May-1993.) (Proof shortened by Wolf Lammen, 19-Nov-2019.) |
Ref | Expression |
---|---|
eqcom |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | id 22 | . . 3 | |
2 | 1 | eqcomd 2628 | . 2 |
3 | id 22 | . . 3 | |
4 | 3 | eqcomd 2628 | . 2 |
5 | 2, 4 | impbii 199 | 1 |
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