Description: Substitution applied to an atomic wff. Class version of eqsb3 . (Contributed by Andrew Salmon, 29-Jun-2011) Avoid ax-13 . (Revised by Wolf Lammen, 29-Apr-2023)
Ref | Expression | ||
---|---|---|---|
Assertion | eqsbc3 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfsbcq | ||
2 | eqeq1 | ||
3 | sbsbc | ||
4 | eqsb3 | ||
5 | 3 4 | bitr3i | |
6 | 1 2 5 | vtoclbg |