Metamath Proof Explorer
Description: Obsolete proof of unex as of 21-Jul-2025. (Contributed by NM, 1-Jul-1994) (Proof modification is discouraged.)
(New usage is discouraged.)
|
|
Ref |
Expression |
|
Hypotheses |
unex.1 |
|
|
|
unex.2 |
|
|
Assertion |
unexOLD |
|
Proof
Step |
Hyp |
Ref |
Expression |
1 |
|
unex.1 |
|
2 |
|
unex.2 |
|
3 |
1 2
|
unipr |
|
4 |
|
prex |
|
5 |
4
|
uniex |
|
6 |
3 5
|
eqeltrri |
|