Proof of Theorem suppvalbr
| Step | Hyp | Ref
| Expression |
| 1 | | suppval 7184 |
. 2
⊢ ((𝑅 ∈ 𝑉 ∧ 𝑍 ∈ 𝑊) → (𝑅 supp 𝑍) = {𝑥 ∈ dom 𝑅 ∣ (𝑅 “ {𝑥}) ≠ {𝑍}}) |
| 2 | | df-rab 2905 |
. . . 4
⊢ {𝑥 ∈ dom 𝑅 ∣ (𝑅 “ {𝑥}) ≠ {𝑍}} = {𝑥 ∣ (𝑥 ∈ dom 𝑅 ∧ (𝑅 “ {𝑥}) ≠ {𝑍})} |
| 3 | | vex 3176 |
. . . . . . 7
⊢ 𝑥 ∈ V |
| 4 | 3 | eldm 5243 |
. . . . . 6
⊢ (𝑥 ∈ dom 𝑅 ↔ ∃𝑦 𝑥𝑅𝑦) |
| 5 | | df-sn 4126 |
. . . . . . . 8
⊢ {𝑍} = {𝑦 ∣ 𝑦 = 𝑍} |
| 6 | 5 | neeq2i 2847 |
. . . . . . 7
⊢ ({𝑦 ∣ 𝑥𝑅𝑦} ≠ {𝑍} ↔ {𝑦 ∣ 𝑥𝑅𝑦} ≠ {𝑦 ∣ 𝑦 = 𝑍}) |
| 7 | | imasng 5406 |
. . . . . . . . 9
⊢ (𝑥 ∈ V → (𝑅 “ {𝑥}) = {𝑦 ∣ 𝑥𝑅𝑦}) |
| 8 | 3, 7 | ax-mp 5 |
. . . . . . . 8
⊢ (𝑅 “ {𝑥}) = {𝑦 ∣ 𝑥𝑅𝑦} |
| 9 | 8 | neeq1i 2846 |
. . . . . . 7
⊢ ((𝑅 “ {𝑥}) ≠ {𝑍} ↔ {𝑦 ∣ 𝑥𝑅𝑦} ≠ {𝑍}) |
| 10 | | nabbi 2884 |
. . . . . . 7
⊢
(∃𝑦(𝑥𝑅𝑦 ↔ ¬ 𝑦 = 𝑍) ↔ {𝑦 ∣ 𝑥𝑅𝑦} ≠ {𝑦 ∣ 𝑦 = 𝑍}) |
| 11 | 6, 9, 10 | 3bitr4i 291 |
. . . . . 6
⊢ ((𝑅 “ {𝑥}) ≠ {𝑍} ↔ ∃𝑦(𝑥𝑅𝑦 ↔ ¬ 𝑦 = 𝑍)) |
| 12 | 4, 11 | anbi12i 729 |
. . . . 5
⊢ ((𝑥 ∈ dom 𝑅 ∧ (𝑅 “ {𝑥}) ≠ {𝑍}) ↔ (∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ ¬ 𝑦 = 𝑍))) |
| 13 | 12 | abbii 2726 |
. . . 4
⊢ {𝑥 ∣ (𝑥 ∈ dom 𝑅 ∧ (𝑅 “ {𝑥}) ≠ {𝑍})} = {𝑥 ∣ (∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ ¬ 𝑦 = 𝑍))} |
| 14 | 2, 13 | eqtri 2632 |
. . 3
⊢ {𝑥 ∈ dom 𝑅 ∣ (𝑅 “ {𝑥}) ≠ {𝑍}} = {𝑥 ∣ (∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ ¬ 𝑦 = 𝑍))} |
| 15 | 14 | a1i 11 |
. 2
⊢ ((𝑅 ∈ 𝑉 ∧ 𝑍 ∈ 𝑊) → {𝑥 ∈ dom 𝑅 ∣ (𝑅 “ {𝑥}) ≠ {𝑍}} = {𝑥 ∣ (∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ ¬ 𝑦 = 𝑍))}) |
| 16 | | df-ne 2782 |
. . . . . . . 8
⊢ (𝑦 ≠ 𝑍 ↔ ¬ 𝑦 = 𝑍) |
| 17 | 16 | bicomi 213 |
. . . . . . 7
⊢ (¬
𝑦 = 𝑍 ↔ 𝑦 ≠ 𝑍) |
| 18 | 17 | bibi2i 326 |
. . . . . 6
⊢ ((𝑥𝑅𝑦 ↔ ¬ 𝑦 = 𝑍) ↔ (𝑥𝑅𝑦 ↔ 𝑦 ≠ 𝑍)) |
| 19 | 18 | exbii 1764 |
. . . . 5
⊢
(∃𝑦(𝑥𝑅𝑦 ↔ ¬ 𝑦 = 𝑍) ↔ ∃𝑦(𝑥𝑅𝑦 ↔ 𝑦 ≠ 𝑍)) |
| 20 | 19 | anbi2i 726 |
. . . 4
⊢
((∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ ¬ 𝑦 = 𝑍)) ↔ (∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ 𝑦 ≠ 𝑍))) |
| 21 | 20 | abbii 2726 |
. . 3
⊢ {𝑥 ∣ (∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ ¬ 𝑦 = 𝑍))} = {𝑥 ∣ (∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ 𝑦 ≠ 𝑍))} |
| 22 | 21 | a1i 11 |
. 2
⊢ ((𝑅 ∈ 𝑉 ∧ 𝑍 ∈ 𝑊) → {𝑥 ∣ (∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ ¬ 𝑦 = 𝑍))} = {𝑥 ∣ (∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ 𝑦 ≠ 𝑍))}) |
| 23 | 1, 15, 22 | 3eqtrd 2648 |
1
⊢ ((𝑅 ∈ 𝑉 ∧ 𝑍 ∈ 𝑊) → (𝑅 supp 𝑍) = {𝑥 ∣ (∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ 𝑦 ≠ 𝑍))}) |