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Mirrors > Home > MPE Home > Th. List > eqcomd | Structured version Visualization version Unicode version |
Description: Deduction from commutative law for class equality. (Contributed by NM, 15-Aug-1994.) Allow shortening of eqcom 2629. (Revised by Wolf Lammen, 19-Nov-2019.) |
Ref | Expression |
---|---|
eqcomd.1 |
Ref | Expression |
---|---|
eqcomd |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2622 | . 2 | |
2 | eqcomd.1 | . . 3 | |
3 | 2 | eqeq1d 2624 | . 2 |
4 | 1, 3 | mpbii 223 | 1 |
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