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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 5672 | . . 3 ⊢ (𝐵 × 𝐶) = {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶)} | |
| 2 | 1 | eleq2i 2858 | . 2 ⊢ (𝐴 ∈ (𝐵 × 𝐶) ↔ 𝐴 ∈ {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶)}) |
| 3 | elopab 5516 | . 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 2146 〈cop 4600 {copab 5178 × cxp 5664 |
| 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 2148 ax-9 2156 ax-ext 2738 ax-sep 5262 ax-pr 5409 |
| 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 2745 df-cleq 2758 df-clel 2841 df-rab 3420 df-v 3460 df-un 3913 df-in 3915 df-ss 3925 df-sn 4595 df-pr 4597 df-op 4601 df-opab 5179 df-xp 5672 |
| This theorem is used by: elxp2 5690 0nelxp 5700 0nelelxp 5701 rabxp 5714 elxp3 5732 elvv 5741 elvvv 5742 dfres3 5988 xpdifid 6170 xpdifcnvepel 6171 dfco2a 6252 elsnxp 6299 tpres 7206 elxp4 7928 elxp5 7929 opabex3d 7971 opabex3rd 7972 opabex3 7973 xp1st 8027 xp2nd 8028 poxp 8133 soxp 8134 xpsnen 9059 xpcomco 9065 xpassen 9069 dfac5lem1 10126 dfac5lem4 10129 axdc4lem 10457 fsum2dlem 15847 fprod2dlem 16060 numclwwlk1lem2fo 30746 satefvfmla0 35931 elima4 36289 brcart 36443 brimg 36448 dibelval3 41962 |
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