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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 7363 | . 2 ⊢ (𝐴∅𝐵) = (∅‘〈𝐴, 𝐵〉) | |
| 2 | 0fv 6875 | . 2 ⊢ (∅‘〈𝐴, 𝐵〉) = ∅ | |
| 3 | 1, 2 | eqtri 2760 | 1 ⊢ (𝐴∅𝐵) = ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1542 ∅c0 4274 〈cop 4574 ‘cfv 6492 (class class class)co 7360 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2709 ax-nul 5241 ax-pr 5370 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-ne 2934 df-rab 3391 df-v 3432 df-dif 3893 df-un 3895 df-ss 3907 df-nul 4275 df-if 4468 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-br 5087 df-dm 5634 df-iota 6448 df-fv 6500 df-ov 7363 |
| This theorem is referenced by: csbov 7405 2mpo0 7609 el2mpocsbcl 8028 homarcl 17986 oppglsm 19608 iswwlksnon 29936 iswspthsnon 29939 mclsrcl 35759 oppcup3 49696 indthinc 49949 indthincALT 49950 prsthinc 49951 lanrcl 50108 ranrcl 50109 rellan 50110 relran 50111 |
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