Metamath Proof Explorer
Description: Bound-variable hypothesis builder for intersection. (Contributed by NM, 2-Feb-1997) (Proof shortened by Andrew Salmon, 12-Aug-2011)
|
|
Ref |
Expression |
|
Hypothesis |
nfint.1 |
|
|
Assertion |
nfint |
|
Proof
Step |
Hyp |
Ref |
Expression |
1 |
|
nfint.1 |
|
2 |
|
dfint2 |
|
3 |
|
nfv |
|
4 |
1 3
|
nfralw |
|
5 |
4
|
nfab |
|
6 |
2 5
|
nfcxfr |
|