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Mirrors > Home > MPE Home > Th. List > r2exlem | Structured version Visualization version Unicode version |
Description: Lemma factoring out common proof steps in r2exf 3060 an r2ex 3061. Introduced to reduce dependencies on axioms. (Contributed by Wolf Lammen, 10-Jan-2020.) |
Ref | Expression |
---|---|
r2exlem.1 |
Ref | Expression |
---|---|
r2exlem |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | exnal 1754 | . . 3 | |
2 | r2exlem.1 | . . 3 | |
3 | 1, 2 | xchbinxr 325 | . 2 |
4 | alinexa 1770 | . . . 4 | |
5 | 4 | con2bii 347 | . . 3 |
6 | 5 | exbii 1774 | . 2 |
7 | ralnex2 3045 | . . 3 | |
8 | 7 | con2bii 347 | . 2 |
9 | 3, 6, 8 | 3bitr4ri 293 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wn 3 wi 4 wb 196 wa 384 wal 1481 wex 1704 wcel 1990 wral 2912 wrex 2913 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 |
This theorem depends on definitions: df-bi 197 df-an 386 df-ex 1705 df-ral 2917 df-rex 2918 |
This theorem is referenced by: r2exf 3060 r2ex 3061 |
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