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| Mirrors > Home > MPE Home > Th. List > 0ov | Structured version Visualization version GIF version | ||
| Description: Operation value of the empty set. (Contributed by AV, 15-May-2021.) |
| Ref | Expression |
|---|---|
| 0ov | ⊢ (𝐴∅𝐵) = ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-ov 7449 | . 2 ⊢ (𝐴∅𝐵) = (∅‘〈𝐴, 𝐵〉) | |
| 2 | 0fv 6952 | . 2 ⊢ (∅‘〈𝐴, 𝐵〉) = ∅ | |
| 3 | 1, 2 | eqtri 2786 | 1 ⊢ (𝐴∅𝐵) = ∅ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: = wceq 1570 ∅c0 4281 〈cop 4838 ‘cfv 6561 (class class class)co 7446 |
| 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-nul 5264 ax-pr 5396 |
| 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-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-ne 2960 df-rab 3417 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 4839 df-uni 4871 df-br 5107 df-dm 5666 df-iota 6515 df-fv 6569 df-ov 7449 |
| This theorem is used by: csbov 7491 2mpo0 7697 el2mpocsbcl 8124 homarcl 18235 oppglsm 19889 iswwlksnon 30475 iswspthsnon 30478 mclsrcl 36506 oppcup3 50540 indthinc 50812 indthincALT 50813 prsthinc 50814 lanrcl 51019 ranrcl 51020 rellan 51021 relran 51022 |
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