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| Mirrors > Home > MPE Home > Th. List > opnzi | Structured version Visualization version GIF version | ||
| Description: An ordered pair is nonempty if the arguments are sets. (Contributed by Mario Carneiro, 26-Apr-2015.) |
| Ref | Expression |
|---|---|
| opth1.1 | ⊢ 𝐴 ∈ V |
| opth1.2 | ⊢ 𝐵 ∈ V |
| Ref | Expression |
|---|---|
| opnzi | ⊢ 〈𝐴, 𝐵〉 ≠ ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | opth1.1 | . 2 ⊢ 𝐴 ∈ V | |
| 2 | opth1.2 | . 2 ⊢ 𝐵 ∈ V | |
| 3 | opnz 5449 | . 2 ⊢ (〈𝐴, 𝐵〉 ≠ ∅ ↔ (𝐴 ∈ V ∧ 𝐵 ∈ V)) | |
| 4 | 1, 2, 3 | mpbir2an 724 | 1 ⊢ 〈𝐴, 𝐵〉 ≠ ∅ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2147 ≠ wne 2959 Vcvv 3454 ∅c0 4281 〈cop 4840 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-ext 2735 ax-sep 5255 ax-pr 5398 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2102 df-clab 2742 df-cleq 2755 df-clel 2839 df-ne 2960 df-v 3456 df-ss 3901 df-dif 4050 df-un 4154 df-nul 4282 df-if 4486 df-sn 4589 df-pr 4591 df-op 4841 |
| This theorem is used by: iunopeqop 5501 opelopabsb 5511 0nelopab 5547 0nelxp 5692 unixp0 6310 funopsnOLD 7184 cnfldfun 21744 fmlaomn0 36363 finxpreclem2 38581 finxp0 38582 finxpreclem6 38587 |
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