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Mirrors > Home > MPE Home > Th. List > 0fv | Structured version Visualization version GIF version |
Description: Function value of the empty set. (Contributed by Stefan O'Rear, 26-Nov-2014.) |
Ref | Expression |
---|---|
0fv | ⊢ (∅‘𝐴) = ∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | noel 4247 | . . 3 ⊢ ¬ 𝐴 ∈ ∅ | |
2 | dm0 5754 | . . . 4 ⊢ dom ∅ = ∅ | |
3 | 2 | eleq2i 2881 | . . 3 ⊢ (𝐴 ∈ dom ∅ ↔ 𝐴 ∈ ∅) |
4 | 1, 3 | mtbir 326 | . 2 ⊢ ¬ 𝐴 ∈ dom ∅ |
5 | ndmfv 6675 | . 2 ⊢ (¬ 𝐴 ∈ dom ∅ → (∅‘𝐴) = ∅) | |
6 | 4, 5 | ax-mp 5 | 1 ⊢ (∅‘𝐴) = ∅ |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 = wceq 1538 ∈ wcel 2111 ∅c0 4243 dom cdm 5519 ‘cfv 6324 |
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 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-nul 5174 ax-pow 5231 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ral 3111 df-rex 3112 df-v 3443 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-nul 4244 df-if 4426 df-sn 4526 df-pr 4528 df-op 4532 df-uni 4801 df-br 5031 df-dm 5529 df-iota 6283 df-fv 6332 |
This theorem is referenced by: fv2prc 6685 csbfv12 6688 0ov 7172 csbov123 7177 csbov 7178 elovmpt3imp 7382 bropopvvv 7768 bropfvvvvlem 7769 itunisuc 9830 ccat1st1st 13975 str0 16527 ressbas 16546 cntrval 18441 cntzval 18443 cntzrcl 18449 rlmval 19956 chrval 20217 ocvval 20356 elocv 20357 opsrle 20715 opsrbaslem 20717 mpfrcl 20757 evlval 20767 psr1val 20815 vr1val 20821 iscnp2 21844 resvsca 30954 mrsubfval 32868 msubfval 32884 poimirlem28 35085 0cnv 42384 |
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