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| Mirrors > Home > ILE Home > Th. List > elxp | GIF version | ||
| Description: Membership in a cross product. (Contributed by NM, 4-Jul-1994.) |
| Ref | Expression |
|---|---|
| elxp | ⊢ (𝐴 ∈ (𝐵 × 𝐶) ↔ ∃𝑥∃𝑦(𝐴 = 〈𝑥, 𝑦〉 ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-xp 4725 | . . 3 ⊢ (𝐵 × 𝐶) = {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶)} | |
| 2 | 1 | eleq2i 2296 | . 2 ⊢ (𝐴 ∈ (𝐵 × 𝐶) ↔ 𝐴 ∈ {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶)}) |
| 3 | elopab 4346 | . 2 ⊢ (𝐴 ∈ {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶)} ↔ ∃𝑥∃𝑦(𝐴 = 〈𝑥, 𝑦〉 ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶))) | |
| 4 | 2, 3 | bitri 184 | 1 ⊢ (𝐴 ∈ (𝐵 × 𝐶) ↔ ∃𝑥∃𝑦(𝐴 = 〈𝑥, 𝑦〉 ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶))) |
| Colors of variables: wff set class |
| Syntax hints: ∧ wa 104 ↔ wb 105 = wceq 1395 ∃wex 1538 ∈ wcel 2200 〈cop 3669 {copab 4144 × cxp 4717 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-14 2203 ax-ext 2211 ax-sep 4202 ax-pow 4258 ax-pr 4293 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-v 2801 df-un 3201 df-in 3203 df-ss 3210 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-opab 4146 df-xp 4725 |
| This theorem is referenced by: elxp2 4737 0nelxp 4747 0nelelxp 4748 rabxp 4756 elxp3 4773 elvv 4781 elvvv 4782 0xp 4799 xpmlem 5149 elxp4 5216 elxp5 5217 dfco2a 5229 opabex3d 6272 opabex3 6273 xp1st 6317 xp2nd 6318 poxp 6384 xpsnen 6988 xpcomco 6993 xpassen 6997 nqnq0pi 7633 fsum2dlemstep 11953 fprod2dlemstep 12141 |
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