Description: Equality-like theorem for equinumerosity. (Contributed by NM, 18-Dec-2003)
Ref | Expression | ||
---|---|---|---|
Assertion | enen1 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ensym | |
|
2 | entr | |
|
3 | 1 2 | sylan | |
4 | entr | |
|
5 | 3 4 | impbida | |