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Mirrors > Home > MPE Home > Th. List > cnvimadfsn | Structured version Visualization version GIF version |
Description: The support of functions "defined" by inverse images expressed by binary relations. (Contributed by AV, 7-Apr-2019.) |
Ref | Expression |
---|---|
cnvimadfsn | ⊢ (◡𝑅 “ (V ∖ {𝑍})) = {𝑥 ∣ ∃𝑦(𝑥𝑅𝑦 ∧ 𝑦 ≠ 𝑍)} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfima3 5469 | . 2 ⊢ (◡𝑅 “ (V ∖ {𝑍})) = {𝑥 ∣ ∃𝑦(𝑦 ∈ (V ∖ {𝑍}) ∧ 〈𝑦, 𝑥〉 ∈ ◡𝑅)} | |
2 | vex 3203 | . . . . . 6 ⊢ 𝑦 ∈ V | |
3 | eldifvsn 4326 | . . . . . 6 ⊢ (𝑦 ∈ V → (𝑦 ∈ (V ∖ {𝑍}) ↔ 𝑦 ≠ 𝑍)) | |
4 | 2, 3 | ax-mp 5 | . . . . 5 ⊢ (𝑦 ∈ (V ∖ {𝑍}) ↔ 𝑦 ≠ 𝑍) |
5 | vex 3203 | . . . . . . 7 ⊢ 𝑥 ∈ V | |
6 | 2, 5 | opelcnv 5304 | . . . . . 6 ⊢ (〈𝑦, 𝑥〉 ∈ ◡𝑅 ↔ 〈𝑥, 𝑦〉 ∈ 𝑅) |
7 | df-br 4654 | . . . . . 6 ⊢ (𝑥𝑅𝑦 ↔ 〈𝑥, 𝑦〉 ∈ 𝑅) | |
8 | 6, 7 | bitr4i 267 | . . . . 5 ⊢ (〈𝑦, 𝑥〉 ∈ ◡𝑅 ↔ 𝑥𝑅𝑦) |
9 | 4, 8 | anbi12ci 734 | . . . 4 ⊢ ((𝑦 ∈ (V ∖ {𝑍}) ∧ 〈𝑦, 𝑥〉 ∈ ◡𝑅) ↔ (𝑥𝑅𝑦 ∧ 𝑦 ≠ 𝑍)) |
10 | 9 | exbii 1774 | . . 3 ⊢ (∃𝑦(𝑦 ∈ (V ∖ {𝑍}) ∧ 〈𝑦, 𝑥〉 ∈ ◡𝑅) ↔ ∃𝑦(𝑥𝑅𝑦 ∧ 𝑦 ≠ 𝑍)) |
11 | 10 | abbii 2739 | . 2 ⊢ {𝑥 ∣ ∃𝑦(𝑦 ∈ (V ∖ {𝑍}) ∧ 〈𝑦, 𝑥〉 ∈ ◡𝑅)} = {𝑥 ∣ ∃𝑦(𝑥𝑅𝑦 ∧ 𝑦 ≠ 𝑍)} |
12 | 1, 11 | eqtri 2644 | 1 ⊢ (◡𝑅 “ (V ∖ {𝑍})) = {𝑥 ∣ ∃𝑦(𝑥𝑅𝑦 ∧ 𝑦 ≠ 𝑍)} |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 196 ∧ wa 384 = wceq 1483 ∃wex 1704 ∈ wcel 1990 {cab 2608 ≠ wne 2794 Vcvv 3200 ∖ cdif 3571 {csn 4177 〈cop 4183 class class class wbr 4653 ◡ccnv 5113 “ cima 5117 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pr 4906 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-ral 2917 df-rex 2918 df-rab 2921 df-v 3202 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 df-sn 4178 df-pr 4180 df-op 4184 df-br 4654 df-opab 4713 df-xp 5120 df-cnv 5122 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 |
This theorem is referenced by: suppimacnvss 7305 suppimacnv 7306 |
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