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| Description: Eliminate a membership
hypothesis for weak deduction theorem, when
special case |
| Ref | Expression |
|---|---|
| elimel.1 |
|
| Ref | Expression |
|---|---|
| elimel |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eleq1 1526 |
. 2
| |
| 2 | eleq1 1526 |
. 2
| |
| 3 | elimel.1 |
. 2
| |
| 4 | 1, 2, 3 | elimhyp 2380 |
1
|