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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 7426 | . 2 ⊢ (𝐴∅𝐵) = (∅‘〈𝐴, 𝐵〉) | |
| 2 | 0fv 6929 | . 2 ⊢ (∅‘〈𝐴, 𝐵〉) = ∅ | |
| 3 | 1, 2 | eqtri 2789 | 1 ⊢ (𝐴∅𝐵) = ∅ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: = wceq 1570 ∅c0 4289 〈cop 4600 ‘cfv 6543 (class class class)co 7423 |
| 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 2738 ax-nul 5274 ax-pr 5409 |
| 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-mo 2570 df-eu 2600 df-clab 2745 df-cleq 2758 df-clel 2841 df-ne 2962 df-rab 3420 df-v 3460 df-dif 3911 df-un 3913 df-ss 3925 df-nul 4290 df-if 4493 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4878 df-br 5115 df-dm 5676 df-iota 6499 df-fv 6551 df-ov 7426 |
| This theorem is used by: csbov 7468 2mpo0 7672 el2mpocsbcl 8089 homarcl 18110 oppglsm 19743 iswwlksnon 30239 iswspthsnon 30242 mclsrcl 36074 oppcup3 50028 indthinc 50281 indthincALT 50282 prsthinc 50283 lanrcl 50440 ranrcl 50441 rellan 50442 relran 50443 |
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