Description: First-order logic and set theory. (Contributed by Jonathan Ben-Naim, 3-Jun-2011) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Hypotheses | bnj982.1 | ||
bnj982.2 | |||
bnj982.3 | |||
bnj982.4 | |||
Assertion | bnj982 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bnj982.1 | ||
2 | bnj982.2 | ||
3 | bnj982.3 | ||
4 | bnj982.4 | ||
5 | df-bnj17 | ||
6 | 1 2 3 | hb3an | |
7 | 6 4 | hban | |
8 | 5 7 | hbxfrbi |