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| Mirrors > Home > MPE Home > Th. List > elxp | Structured version Visualization version GIF version | ||
| Description: Membership in a Cartesian 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 5657 | . . 3 ⊢ (𝐵 × 𝐶) = {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶)} | |
| 2 | 1 | eleq2i 2853 | . 2 ⊢ (𝐴 ∈ (𝐵 × 𝐶) ↔ 𝐴 ∈ {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶)}) |
| 3 | elopab 5501 | . 2 ⊢ (𝐴 ∈ {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶)} ↔ ∃𝑥∃𝑦(𝐴 = 〈𝑥, 𝑦〉 ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶))) | |
| 4 | 2, 3 | bitri 278 | 1 ⊢ (𝐴 ∈ (𝐵 × 𝐶) ↔ ∃𝑥∃𝑦(𝐴 = 〈𝑥, 𝑦〉 ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶))) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ↔ wb 209 ∧ wa 401 = wceq 1570 ∃wex 1812 ∈ wcel 2145 〈cop 4590 {copab 5167 × cxp 5649 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2733 ax-sep 5249 ax-pr 5391 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-ex 1813 df-sb 2100 df-clab 2740 df-cleq 2753 df-clel 2836 df-rab 3414 df-v 3453 df-un 3904 df-in 3906 df-ss 3916 df-sn 4585 df-pr 4587 df-op 4591 df-opab 5168 df-xp 5657 |
| This theorem is used by: elxp2 5675 0nelxp 5685 0nelelxp 5686 rabxp 5699 elxp3 5717 elvv 5726 elvvv 5727 dfres3 5975 xpdifid 6158 xpdifcnvepel 6159 dfco2a 6240 elsnxp 6287 tpres 7199 elxp4 7923 elxp5 7924 opabex3d 7966 opabex3rd 7967 opabex3 7968 xp1st 8022 xp2nd 8023 poxp 8129 soxp 8130 xpsnen 9064 xpcomco 9070 xpassen 9074 dfac5lem1 10183 dfac5lem4 10186 axdc4lem 10514 fsum2dlem 15916 fprod2dlem 16127 mgmn0plusgf 18807 mgmn0plusgplusf 18808 numclwwlk1lem2fo 30941 satefvfmla0 36152 elima4 36510 brcart 36664 brimg 36669 dibelval3 42172 |
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