Description: The sets in the cartesian product of singletons with other sets, are disjoint. (Contributed by Glauco Siliprandi, 11-Oct-2020)
Ref | Expression | ||
---|---|---|---|
Assertion | disjsnxp |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sndisj | ||
2 | 1 | a1i | |
3 | 2 | disjxp1 | |
4 | 3 | mptru |