Description: Value of a function given by the maps-to notation, outside of its domain. (Contributed by AV, 31-Dec-2020)
Ref | Expression | ||
---|---|---|---|
Hypothesis | fvmptndm.1 | ||
Assertion | fvmptndm |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fvmptndm.1 | ||
2 | df-mpt | ||
3 | 1 2 | eqtri | |
4 | 3 | fvopab4ndm |