Description: Equality theorem for the range Cartesian product. (Contributed by Peter Mazsa, 16-Dec-2020)
Ref | Expression | ||
---|---|---|---|
Assertion | xrneq1 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | coeq2 | |
|
2 | 1 | ineq1d | |
3 | df-xrn | |
|
4 | df-xrn | |
|
5 | 2 3 4 | 3eqtr4g | |