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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 5656 | . . 3 ⊢ (𝐵 × 𝐶) = {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶)} | |
| 2 | 1 | eleq2i 2852 | . 2 ⊢ (𝐴 ∈ (𝐵 × 𝐶) ↔ 𝐴 ∈ {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶)}) |
| 3 | elopab 5500 | . 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 1569 ∃wex 1811 ∈ wcel 2144 〈cop 4834 {copab 5166 × cxp 5648 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-ext 2732 ax-sep 5248 ax-pr 5390 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-ex 1812 df-sb 2099 df-clab 2739 df-cleq 2752 df-clel 2835 df-rab 3413 df-v 3452 df-ss 3896 df-in 4091 df-un 4151 df-sn 4585 df-pr 4587 df-op 4835 df-opab 5167 df-xp 5656 |
| This theorem is used by: elxp2 5674 0nelxp 5684 0nelelxp 5685 rabxp 5698 elxp3 5716 elvv 5725 elvvv 5726 dfres3 5974 xpdifid 6158 xpdifcnvepel 6159 dfco2a 6247 elsnxp 6294 tpres 7207 elxp4 7934 elxp5 7935 opabex3d 7977 opabex3rd 7978 opabex3 7979 xp1st 8033 xp2nd 8034 poxp 8142 soxp 8143 xpsnen 9083 xpcomco 9089 xpassen 9093 dfac5lem1 10205 dfac5lem4 10208 axdc4lem 10536 fsum2dlem 15941 fprod2dlem 16152 mgmn0plusgf 18832 mgmn0plusgplusf 18833 numclwwlk1lem2fo 30964 satefvfmla0 36269 elima4 36632 brcart 36786 brimg 36791 coi1in 38053 dibelval3 42297 |
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