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| Mirrors > Home > MPE Home > Th. List > Mathboxes > epnsymrel | Structured version Visualization version GIF version | ||
| Description: The membership (epsilon) relation is not symmetric. (Contributed by AV, 18-Jun-2022.) |
| Ref | Expression |
|---|---|
| epnsymrel | ⊢ ¬ SymRel E |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | epnsym 9521 | . . . 4 ⊢ ◡ E ≠ E | |
| 2 | 1 | neii 2935 | . . 3 ⊢ ¬ ◡ E = E |
| 3 | 2 | intnanr 487 | . 2 ⊢ ¬ (◡ E = E ∧ Rel E ) |
| 4 | dfsymrel4 38970 | . 2 ⊢ ( SymRel E ↔ (◡ E = E ∧ Rel E )) | |
| 5 | 3, 4 | mtbir 323 | 1 ⊢ ¬ SymRel E |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 ∧ wa 395 = wceq 1542 E cep 5523 ◡ccnv 5623 Rel wrel 5629 SymRel wsymrel 38530 |
| 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-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5231 ax-nul 5241 ax-pr 5370 ax-reg 9500 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-clab 2716 df-cleq 2729 df-clel 2812 df-ne 2934 df-ral 3053 df-rex 3063 df-rab 3391 df-v 3432 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-br 5087 df-opab 5149 df-eprel 5524 df-fr 5577 df-xp 5630 df-rel 5631 df-cnv 5632 df-dm 5634 df-rn 5635 df-res 5636 df-symrel 38959 |
| This theorem is referenced by: (None) |
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