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| Description: Deduction from commutative law for class equality. |
| Ref | Expression |
|---|---|
| eqcomd.1 |
|
| Ref | Expression |
|---|---|
| eqcomd |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqcomd.1 |
. 2
| |
| 2 | eqcom 1469 |
. 2
| |
| 3 | 1, 2 | sylib 198 |
1
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