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Mirrors > Home > MPE Home > Th. List > equs5e | Structured version Visualization version Unicode version |
Description: A property related to substitution that unlike equs5 2351 does not require a distinctor antecedent. See equs5eALT 2178 for an alternate proof using ax-12 2047 but not ax13 2249. (Contributed by NM, 2-Feb-2007.) (Proof shortened by Wolf Lammen, 15-Jan-2018.) |
Ref | Expression |
---|---|
equs5e |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfa1 2028 | . 2 | |
2 | ax12 2304 | . . 3 | |
3 | hbe1 2021 | . . . 4 | |
4 | 3 | 19.23bi 2061 | . . 3 |
5 | 2, 4 | impel 485 | . 2 |
6 | 1, 5 | exlimi 2086 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wi 4 wa 384 wal 1481 wex 1704 |
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 ax-10 2019 ax-12 2047 ax-13 2246 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-ex 1705 df-nf 1710 |
This theorem is referenced by: sb4e 2362 |
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