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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 3595 | . . 3 ⊢ ∀𝑥 ∈ ∅ 𝐴 ∈ V | |
| 2 | eqid 2230 | . . . 4 ⊢ (𝑥 ∈ ∅ ↦ 𝐴) = (𝑥 ∈ ∅ ↦ 𝐴) | |
| 3 | 2 | fnmpt 5461 | . . 3 ⊢ (∀𝑥 ∈ ∅ 𝐴 ∈ V → (𝑥 ∈ ∅ ↦ 𝐴) Fn ∅) |
| 4 | 1, 3 | ax-mp 5 | . 2 ⊢ (𝑥 ∈ ∅ ↦ 𝐴) Fn ∅ |
| 5 | fn0 5454 | . 2 ⊢ ((𝑥 ∈ ∅ ↦ 𝐴) Fn ∅ ↔ (𝑥 ∈ ∅ ↦ 𝐴) = ∅) | |
| 6 | 4, 5 | mpbi 145 | 1 ⊢ (𝑥 ∈ ∅ ↦ 𝐴) = ∅ |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1397 ∈ wcel 2201 ∀wral 2509 Vcvv 2801 ∅c0 3493 ↦ cmpt 4151 Fn wfn 5323 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-14 2204 ax-ext 2212 ax-sep 4208 ax-nul 4216 ax-pow 4266 ax-pr 4301 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-fal 1403 df-nf 1509 df-sb 1810 df-eu 2081 df-mo 2082 df-clab 2217 df-cleq 2223 df-clel 2226 df-nfc 2362 df-ral 2514 df-rex 2515 df-v 2803 df-dif 3201 df-un 3203 df-in 3205 df-ss 3212 df-nul 3494 df-pw 3655 df-sn 3676 df-pr 3677 df-op 3679 df-br 4090 df-opab 4152 df-mpt 4153 df-id 4392 df-xp 4733 df-rel 4734 df-cnv 4735 df-co 4736 df-dm 4737 df-fun 5330 df-fn 5331 |
| This theorem is referenced by: fmptpr 5849 swrd00g 11239 swrdlend 11248 mulgnn0gsum 13738 gsumfzfsumlem0 14624 |
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