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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 7423 | . 2 ⊢ (𝐴∅𝐵) = (∅‘〈𝐴, 𝐵〉) | |
| 2 | 0fv 6926 | . 2 ⊢ (∅‘〈𝐴, 𝐵〉) = ∅ | |
| 3 | 1, 2 | eqtri 2783 | 1 ⊢ (𝐴∅𝐵) = ∅ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: = wceq 1569 ∅c0 4278 〈cop 4834 ‘cfv 6538 (class class class)co 7420 |
| 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-nul 5259 ax-pr 5390 |
| 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-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-ne 2956 df-rab 3413 df-v 3452 df-ss 3896 df-dif 4047 df-un 4151 df-nul 4279 df-if 4482 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-br 5103 df-dm 5660 df-iota 6494 df-fv 6546 df-ov 7423 |
| This theorem is used by: csbov 7465 2mpo0 7670 el2mpocsbcl 8096 homarcl 18208 oppglsm 19861 iswwlksnon 30447 iswspthsnon 30450 mclsrcl 36412 oppcup3 50418 indthinc 50690 indthincALT 50691 prsthinc 50692 lanrcl 50897 ranrcl 50898 rellan 50899 relran 50900 |
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