Description: An operation's value belongs to its codomain. (Contributed by Mario Carneiro, 29-Dec-2016)
Ref | Expression | ||
---|---|---|---|
Hypothesis | fovrnd.1 | |
|
Assertion | fovrnda | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fovrnd.1 | |
|
2 | fovrn | |
|
3 | 1 2 | syl3an1 | |
4 | 3 | 3expb | |