Metamath Proof Explorer
Description: Equality theorem for image. (Contributed by Mario Carneiro, 4-Dec-2016)
|
|
Ref |
Expression |
|
Hypotheses |
imaeq1d.1 |
|
|
|
imaeq12d.2 |
|
|
Assertion |
imaeq12d |
|
Proof
Step |
Hyp |
Ref |
Expression |
1 |
|
imaeq1d.1 |
|
2 |
|
imaeq12d.2 |
|
3 |
1
|
imaeq1d |
|
4 |
2
|
imaeq2d |
|
5 |
3 4
|
eqtrd |
|