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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 5442 | . 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 2144 ≠ wne 2955 Vcvv 3450 ∅c0 4277 〈cop 4834 |
| 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 5391 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-sb 2099 df-clab 2739 df-cleq 2752 df-clel 2835 df-ne 2956 df-v 3452 df-ss 3897 df-dif 4046 df-un 4150 df-nul 4278 df-if 4482 df-sn 4585 df-pr 4587 df-op 4835 |
| This theorem is used by: iunopeqop 5494 opelopabsb 5504 0nelopab 5540 0nelxp 5685 unixp0 6289 funopsnOLD 7157 cnfldfun 21701 fmlaomn0 36273 finxpreclem2 38450 finxp0 38451 finxpreclem6 38456 |
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