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Mirrors > Home > MPE Home > Th. List > excomim | Structured version Visualization version GIF version |
Description: One direction of Theorem 19.11 of [Margaris] p. 89. (Contributed by NM, 5-Aug-1993.) (Revised by Mario Carneiro, 24-Sep-2016.) Remove dependencies on ax-5 1911, ax-6 1970, ax-7 2015, ax-10 2142, ax-12 2175. (Revised by Wolf Lammen, 8-Jan-2018.) |
Ref | Expression |
---|---|
excomim | ⊢ (∃𝑥∃𝑦𝜑 → ∃𝑦∃𝑥𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | excom 2166 | . 2 ⊢ (∃𝑥∃𝑦𝜑 ↔ ∃𝑦∃𝑥𝜑) | |
2 | 1 | biimpi 219 | 1 ⊢ (∃𝑥∃𝑦𝜑 → ∃𝑦∃𝑥𝜑) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∃wex 1781 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-11 2158 |
This theorem depends on definitions: df-bi 210 df-ex 1782 |
This theorem is referenced by: 2euswapv 2692 2euswap 2707 relopabi 5658 lfuhgr3 32479 umgr2cycl 32501 ax6e2eq 41263 ax6e2nd 41264 ax6e2eqVD 41613 ax6e2ndVD 41614 ax6e2ndALT 41636 |
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