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| Mirrors > Home > ILE Home > Th. List > eleq2s | Unicode version | ||
| Description: Substitution of equal classes into a membership antecedent. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) |
| Ref | Expression |
|---|---|
| eleq2s.1 |
|
| eleq2s.2 |
|
| Ref | Expression |
|---|---|
| eleq2s |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eleq2s.2 |
. . 3
| |
| 2 | 1 | eleq2i 2263 |
. 2
|
| 3 | eleq2s.1 |
. 2
| |
| 4 | 2, 3 | sylbi 121 |
1
|
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