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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 5457 | . 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 2146 ≠ wne 2960 Vcvv 3457 ∅c0 4286 〈cop 4597 |
| 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 2737 ax-sep 5259 ax-pr 5406 |
| 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 2100 df-clab 2744 df-cleq 2757 df-clel 2840 df-ne 2961 df-v 3459 df-dif 3909 df-un 3911 df-ss 3923 df-nul 4287 df-if 4490 df-sn 4592 df-pr 4594 df-op 4598 |
| This theorem is used by: iunopeqop 5506 opelopabsb 5516 0nelopab 5552 0nelxp 5697 unixp0 6288 funopsnOLD 7151 cnfldfun 21588 fmlaomn0 35921 finxpreclem2 38095 finxp0 38096 finxpreclem6 38101 |
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