Description: Membership in the class of all transitive sets. (Contributed by Scott Fenton, 31-Mar-2012)
Ref | Expression | ||
---|---|---|---|
Hypothesis | eltrans.1 | ||
Assertion | eltrans |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eltrans.1 | ||
2 | df-trans | ||
3 | 2 | eleq2i | |
4 | 1 | dftr6 | |
5 | 3 4 | bitr4i |