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| Mirrors > Home > ILE Home > Th. List > blfn | GIF version | ||
| Description: The ball function has universal domain. (Contributed by Jim Kingdon, 24-Sep-2025.) |
| Ref | Expression |
|---|---|
| blfn | ⊢ ball Fn V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | vex 2782 | . . . . 5 ⊢ 𝑑 ∈ V | |
| 2 | 1 | dmex 4967 | . . . 4 ⊢ dom 𝑑 ∈ V |
| 3 | 2 | dmex 4967 | . . 3 ⊢ dom dom 𝑑 ∈ V |
| 4 | xrex 10020 | . . 3 ⊢ ℝ* ∈ V | |
| 5 | 3, 4 | mpoex 6330 | . 2 ⊢ (𝑥 ∈ dom dom 𝑑, 𝑧 ∈ ℝ* ↦ {𝑦 ∈ dom dom 𝑑 ∣ (𝑥𝑑𝑦) < 𝑧}) ∈ V |
| 6 | df-bl 14475 | . 2 ⊢ ball = (𝑑 ∈ V ↦ (𝑥 ∈ dom dom 𝑑, 𝑧 ∈ ℝ* ↦ {𝑦 ∈ dom dom 𝑑 ∣ (𝑥𝑑𝑦) < 𝑧})) | |
| 7 | 5, 6 | fnmpti 5428 | 1 ⊢ ball Fn V |
| Colors of variables: wff set class |
| Syntax hints: {crab 2492 Vcvv 2779 class class class wbr 4062 dom cdm 4696 Fn wfn 5289 (class class class)co 5974 ∈ cmpo 5976 ℝ*cxr 8148 < clt 8149 ballcbl 14467 |
| 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-io 713 ax-5 1473 ax-7 1474 ax-gen 1475 ax-ie1 1519 ax-ie2 1520 ax-8 1530 ax-10 1531 ax-11 1532 ax-i12 1533 ax-bndl 1535 ax-4 1536 ax-17 1552 ax-i9 1556 ax-ial 1560 ax-i5r 1561 ax-13 2182 ax-14 2183 ax-ext 2191 ax-coll 4178 ax-sep 4181 ax-pow 4237 ax-pr 4272 ax-un 4501 ax-cnex 8058 ax-resscn 8059 |
| This theorem depends on definitions: df-bi 117 df-3an 985 df-tru 1378 df-nf 1487 df-sb 1789 df-eu 2060 df-mo 2061 df-clab 2196 df-cleq 2202 df-clel 2205 df-nfc 2341 df-ral 2493 df-rex 2494 df-reu 2495 df-rab 2497 df-v 2781 df-sbc 3009 df-csb 3105 df-un 3181 df-in 3183 df-ss 3190 df-pw 3631 df-sn 3652 df-pr 3653 df-op 3655 df-uni 3868 df-iun 3946 df-br 4063 df-opab 4125 df-mpt 4126 df-id 4361 df-xp 4702 df-rel 4703 df-cnv 4704 df-co 4705 df-dm 4706 df-rn 4707 df-res 4708 df-ima 4709 df-iota 5254 df-fun 5296 df-fn 5297 df-f 5298 df-f1 5299 df-fo 5300 df-f1o 5301 df-fv 5302 df-oprab 5978 df-mpo 5979 df-1st 6256 df-2nd 6257 df-pnf 8151 df-mnf 8152 df-xr 8153 df-bl 14475 |
| This theorem is referenced by: mopnset 14481 |
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