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Related theorems GIF version |
| Description: A strict order relation is irreflexive. |
| Ref | Expression |
|---|---|
| soi.1 | ⊢ A ∈ V |
| soi.2 | ⊢ R Or S |
| soi.3 | ⊢ R ⊆ (S × S) |
| Ref | Expression |
|---|---|
| soirri | ⊢ ¬ ARA |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | soi.2 | . . . 4 ⊢ R Or S | |
| 2 | sonr 2143 | . . . 4 ⊢ ((R Or S ∧ A ∈ S) → ¬ ARA) | |
| 3 | 1, 2 | mpan 518 | . . 3 ⊢ (A ∈ S → ¬ ARA) |
| 4 | 3 | adantl 305 | . 2 ⊢ ((A ∈ S ∧ A ∈ S) → ¬ ARA) |
| 5 | soi.1 | . . . 4 ⊢ A ∈ V | |
| 6 | soi.3 | . . . 4 ⊢ R ⊆ (S × S) | |
| 7 | 5, 6 | brel 2459 | . . 3 ⊢ (ARA → (A ∈ S ∧ A ∈ S)) |
| 8 | 7 | con3i 90 | . 2 ⊢ (¬ (A ∈ S ∧ A ∈ S) → ¬ ARA) |
| 9 | 4, 8 | pm2.61i 110 | 1 ⊢ ¬ ARA |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 1 ∧ wa 196 ∈ wcel 1092 Vcvv 1348 ⊆ wss 1487 class class class wbr 2054 Or wor 2059 × cxp 2408 |
| This theorem is referenced by: son2lpi 2631 ltrpq 3879 1pr 3911 ltapr 3945 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-13 804 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 ax-pow 1077 |
| This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-3an 583 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-ral 1205 df-v 1349 df-dif 1489 df-un 1490 df-in 1491 df-ss 1492 df-nul 1708 df-pw 1799 df-sn 1811 df-pr 1812 df-op 1815 df-br 2063 df-opab 2098 df-po 2128 df-so 2138 df-xp 2424 |