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Mirrors > Home > ILE Home > Th. List > mpt0 | GIF version |
Description: A mapping operation with empty domain. (Contributed by Mario Carneiro, 28-Dec-2014.) |
Ref | Expression |
---|---|
mpt0 | ⊢ (𝑥 ∈ ∅ ↦ 𝐴) = ∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ral0 3496 | . . 3 ⊢ ∀𝑥 ∈ ∅ 𝐴 ∈ V | |
2 | eqid 2157 | . . . 4 ⊢ (𝑥 ∈ ∅ ↦ 𝐴) = (𝑥 ∈ ∅ ↦ 𝐴) | |
3 | 2 | fnmpt 5298 | . . 3 ⊢ (∀𝑥 ∈ ∅ 𝐴 ∈ V → (𝑥 ∈ ∅ ↦ 𝐴) Fn ∅) |
4 | 1, 3 | ax-mp 5 | . 2 ⊢ (𝑥 ∈ ∅ ↦ 𝐴) Fn ∅ |
5 | fn0 5291 | . 2 ⊢ ((𝑥 ∈ ∅ ↦ 𝐴) Fn ∅ ↔ (𝑥 ∈ ∅ ↦ 𝐴) = ∅) | |
6 | 4, 5 | mpbi 144 | 1 ⊢ (𝑥 ∈ ∅ ↦ 𝐴) = ∅ |
Colors of variables: wff set class |
Syntax hints: = wceq 1335 ∈ wcel 2128 ∀wral 2435 Vcvv 2712 ∅c0 3395 ↦ cmpt 4027 Fn wfn 5167 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1427 ax-7 1428 ax-gen 1429 ax-ie1 1473 ax-ie2 1474 ax-8 1484 ax-10 1485 ax-11 1486 ax-i12 1487 ax-bndl 1489 ax-4 1490 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-14 2131 ax-ext 2139 ax-sep 4084 ax-nul 4092 ax-pow 4137 ax-pr 4171 |
This theorem depends on definitions: df-bi 116 df-3an 965 df-tru 1338 df-fal 1341 df-nf 1441 df-sb 1743 df-eu 2009 df-mo 2010 df-clab 2144 df-cleq 2150 df-clel 2153 df-nfc 2288 df-ral 2440 df-rex 2441 df-v 2714 df-dif 3104 df-un 3106 df-in 3108 df-ss 3115 df-nul 3396 df-pw 3546 df-sn 3567 df-pr 3568 df-op 3570 df-br 3968 df-opab 4028 df-mpt 4029 df-id 4255 df-xp 4594 df-rel 4595 df-cnv 4596 df-co 4597 df-dm 4598 df-fun 5174 df-fn 5175 |
This theorem is referenced by: fmptpr 5661 |
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