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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 5666 | . . 3 ⊢ (𝐵 × 𝐶) = {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶)} | |
| 2 | 1 | eleq2i 2854 | . 2 ⊢ (𝐴 ∈ (𝐵 × 𝐶) ↔ 𝐴 ∈ {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶)}) |
| 3 | elopab 5510 | . 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 400 = wceq 1569 ∃wex 1808 ∈ wcel 2142 〈cop 4594 {copab 5172 × cxp 5658 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1824 ax-4 1838 ax-5 1939 ax-6 1996 ax-7 2037 ax-8 2144 ax-9 2152 ax-ext 2734 ax-sep 5256 ax-pr 5403 |
| This proof depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1104 df-tru 1572 df-ex 1809 df-sb 2096 df-clab 2741 df-cleq 2754 df-clel 2837 df-rab 3416 df-v 3456 df-un 3909 df-in 3911 df-ss 3921 df-sn 4589 df-pr 4591 df-op 4595 df-opab 5173 df-xp 5666 |
| This theorem is used by: elxp2 5684 0nelxp 5694 0nelelxp 5695 rabxp 5708 elxp3 5726 elvv 5735 elvvv 5736 dfres3 5982 xpdifid 6164 xpdifcnvepel 6165 dfco2a 6246 elsnxp 6292 tpres 7199 elxp4 7917 elxp5 7918 opabex3d 7960 opabex3rd 7961 opabex3 7962 xp1st 8016 xp2nd 8017 poxp 8122 soxp 8123 xpsnen 9047 xpcomco 9053 xpassen 9057 dfac5lem1 10114 dfac5lem4 10117 axdc4lem 10445 fsum2dlem 15828 fprod2dlem 16041 numclwwlk1lem2fo 30720 satefvfmla0 35918 elima4 36276 brcart 36430 brimg 36435 dibelval3 41949 |
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