Description: Equality-like theorem for equinumerosity. (Contributed by NM, 18-Dec-2003)
Ref | Expression | ||
---|---|---|---|
Assertion | enen2 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | entr | |
|
2 | 1 | ancoms | |
3 | ensym | |
|
4 | entr | |
|
5 | 4 | ancoms | |
6 | 3 5 | sylan | |
7 | 2 6 | impbida | |