Metamath Proof Explorer
Description: The multiplication operation is a set. (Contributed by NM, 19-Oct-2004)
(Revised by Mario Carneiro, 17-Nov-2014)
|
|
Ref |
Expression |
|
Assertion |
mulex |
|
Proof
Step |
Hyp |
Ref |
Expression |
1 |
|
ax-mulf |
|
2 |
|
cnex |
|
3 |
2 2
|
xpex |
|
4 |
|
fex2 |
|
5 |
1 3 2 4
|
mp3an |
|