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Related theorems GIF version |
| Description: Any operation is commutative outside its domain. |
| Ref | Expression |
|---|---|
| ndmopr.1 | ⊢ B ∈ V |
| ndmopr.2 | ⊢ dom F = (S × S) |
| ndmopr.3 | ⊢ A ∈ V |
| Ref | Expression |
|---|---|
| ndmoprcom | ⊢ (¬ (A ∈ S ∧ B ∈ S) → (AFB) = (BFA)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ndmopr.1 | . . 3 ⊢ B ∈ V | |
| 2 | ndmopr.2 | . . 3 ⊢ dom F = (S × S) | |
| 3 | 1, 2 | ndmopr 3059 | . 2 ⊢ (¬ (A ∈ S ∧ B ∈ S) → (AFB) = ∅) |
| 4 | ancom 333 | . . . 4 ⊢ ((A ∈ S ∧ B ∈ S) ↔ (B ∈ S ∧ A ∈ S)) | |
| 5 | 4 | negbii 162 | . . 3 ⊢ (¬ (A ∈ S ∧ B ∈ S) ↔ ¬ (B ∈ S ∧ A ∈ S)) |
| 6 | ndmopr.3 | . . . 4 ⊢ A ∈ V | |
| 7 | 6, 2 | ndmopr 3059 | . . 3 ⊢ (¬ (B ∈ S ∧ A ∈ S) → (BFA) = ∅) |
| 8 | 5, 7 | sylbi 174 | . 2 ⊢ (¬ (A ∈ S ∧ B ∈ S) → (BFA) = ∅) |
| 9 | 3, 8 | eqtr4d 1131 | 1 ⊢ (¬ (A ∈ S ∧ B ∈ S) → (AFB) = (BFA)) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 1 → wi 2 ∧ wa 196 = wceq 1091 ∈ wcel 1092 Vcvv 1348 ∅c0 1707 × cxp 2408 dom cdm 2410 (class class class)co 3001 |
| This theorem is referenced by: addcompi 3816 mulcompi 3818 addcompq 3856 mulcompq 3858 addcompr 3917 mulcompr 3919 addcomsr 3990 mulcomsr 3992 |
| 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-ex 679 df-sb 853 df-eu 1009 df-clab 1093 df-cleq 1097 df-clel 1099 df-rex 1206 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-uni 1920 df-br 2063 df-opab 2098 df-xp 2424 df-cnv 2426 df-dm 2428 df-rn 2429 df-res 2430 df-ima 2431 df-fv 2438 df-opr 3003 |