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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 3563 | . . 3 ⊢ ∀𝑥 ∈ ∅ 𝐴 ∈ V | |
| 2 | eqid 2206 | . . . 4 ⊢ (𝑥 ∈ ∅ ↦ 𝐴) = (𝑥 ∈ ∅ ↦ 𝐴) | |
| 3 | 2 | fnmpt 5408 | . . 3 ⊢ (∀𝑥 ∈ ∅ 𝐴 ∈ V → (𝑥 ∈ ∅ ↦ 𝐴) Fn ∅) |
| 4 | 1, 3 | ax-mp 5 | . 2 ⊢ (𝑥 ∈ ∅ ↦ 𝐴) Fn ∅ |
| 5 | fn0 5401 | . 2 ⊢ ((𝑥 ∈ ∅ ↦ 𝐴) Fn ∅ ↔ (𝑥 ∈ ∅ ↦ 𝐴) = ∅) | |
| 6 | 4, 5 | mpbi 145 | 1 ⊢ (𝑥 ∈ ∅ ↦ 𝐴) = ∅ |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1373 ∈ wcel 2177 ∀wral 2485 Vcvv 2773 ∅c0 3461 ↦ cmpt 4109 Fn wfn 5271 |
| 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 615 ax-in2 616 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-14 2180 ax-ext 2188 ax-sep 4166 ax-nul 4174 ax-pow 4222 ax-pr 4257 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-fal 1379 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-ral 2490 df-rex 2491 df-v 2775 df-dif 3169 df-un 3171 df-in 3173 df-ss 3180 df-nul 3462 df-pw 3619 df-sn 3640 df-pr 3641 df-op 3643 df-br 4048 df-opab 4110 df-mpt 4111 df-id 4344 df-xp 4685 df-rel 4686 df-cnv 4687 df-co 4688 df-dm 4689 df-fun 5278 df-fn 5279 |
| This theorem is referenced by: fmptpr 5783 swrd00g 11110 swrdlend 11119 mulgnn0gsum 13508 gsumfzfsumlem0 14392 |
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