Metamath Proof Explorer
Description: Equality of a class variable and a class abstraction (deduction form of
eqabb ). (Contributed by NM, 16-Nov-1995)
|
|
Ref |
Expression |
|
Hypothesis |
eqabrd.1 |
|
|
Assertion |
eqabrd |
|
Proof
Step |
Hyp |
Ref |
Expression |
1 |
|
eqabrd.1 |
|
2 |
1
|
eleq2d |
|
3 |
|
abid |
|
4 |
2 3
|
bitrdi |
|