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Mirrors > Home > MPE Home > Th. List > Mathboxes > bj-ssbjust | Structured version Visualization version Unicode version |
Description: Justification theorem for df-ssb 32620 from Tarski's FOL. (Contributed by BJ, 9-Nov-2021.) |
Ref | Expression |
---|---|
bj-ssbjust |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | equequ1 1952 | . . 3 | |
2 | equequ2 1953 | . . . . 5 | |
3 | 2 | imbi1d 331 | . . . 4 |
4 | 3 | albidv 1849 | . . 3 |
5 | 1, 4 | imbi12d 334 | . 2 |
6 | 5 | cbvalvw 1969 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wi 4 wb 196 wal 1481 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 |
This theorem depends on definitions: df-bi 197 df-an 386 df-ex 1705 |
This theorem is referenced by: (None) |
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