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Related theorems GIF version |
| Description: Domain of closure of an operation. |
| Ref | Expression |
|---|---|
| oprssdm.1 | ⊢ ¬ ∅ ∈ S |
| oprssdm.2 | ⊢ ((x ∈ S ∧ y ∈ S) → (xFy) ∈ S) |
| Ref | Expression |
|---|---|
| oprssdm | ⊢ (S × S) ⊆ dom F |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | relxp 2486 | . 2 ⊢ Rel (S × S) | |
| 2 | visset 1350 | . . . 4 ⊢ y ∈ V | |
| 3 | 2 | opelxp 2452 | . . 3 ⊢ (〈x, y〉 ∈ (S × S) ↔ (x ∈ S ∧ y ∈ S)) |
| 4 | ndmfv 2848 | . . . . 5 ⊢ (¬ 〈x, y〉 ∈ dom F → (F ‘〈x, y〉) = ∅) | |
| 5 | df-opr 3003 | . . . . . . 7 ⊢ (xFy) = (F ‘〈x, y〉) | |
| 6 | 5 | cleq1i 1108 | . . . . . 6 ⊢ ((xFy) = ∅ ↔ (F ‘〈x, y〉) = ∅) |
| 7 | oprssdm.1 | . . . . . . . 8 ⊢ ¬ ∅ ∈ S | |
| 8 | eleq1 1149 | . . . . . . . 8 ⊢ ((xFy) = ∅ → ((xFy) ∈ S ↔ ∅ ∈ S)) | |
| 9 | 7, 8 | mtbiri 539 | . . . . . . 7 ⊢ ((xFy) = ∅ → ¬ (xFy) ∈ S) |
| 10 | oprssdm.2 | . . . . . . 7 ⊢ ((x ∈ S ∧ y ∈ S) → (xFy) ∈ S) | |
| 11 | 9, 10 | nsyl 102 | . . . . . 6 ⊢ ((xFy) = ∅ → ¬ (x ∈ S ∧ y ∈ S)) |
| 12 | 6, 11 | sylbir 176 | . . . . 5 ⊢ ((F ‘〈x, y〉) = ∅ → ¬ (x ∈ S ∧ y ∈ S)) |
| 13 | 4, 12 | syl 12 | . . . 4 ⊢ (¬ 〈x, y〉 ∈ dom F → ¬ (x ∈ S ∧ y ∈ S)) |
| 14 | 13 | a3i 69 | . . 3 ⊢ ((x ∈ S ∧ y ∈ S) → 〈x, y〉 ∈ dom F) |
| 15 | 3, 14 | sylbi 174 | . 2 ⊢ (〈x, y〉 ∈ (S × S) → 〈x, y〉 ∈ dom F) |
| 16 | 1, 15 | relssi 2481 | 1 ⊢ (S × S) ⊆ dom F |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 1 → wi 2 ∧ wa 196 = wceq 1091 ∈ wcel 1092 ⊆ wss 1487 ∅c0 1707 〈cop 1810 × cxp 2408 dom cdm 2410 ‘cfv 2422 (class class class)co 3001 |
| This theorem is referenced by: dmaddpq 3853 dmmulpq 3855 dmaddsr 3988 dmmulsr 3989 |
| 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-rel 2425 df-cnv 2426 df-dm 2428 df-rn 2429 df-res 2430 df-ima 2431 df-fv 2438 df-opr 3003 |