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| Mirrors > Home > ILE Home > Th. List > cndsex | GIF version | ||
| Description: The standard distance function on the complex numbers is a set. (Contributed by Jim Kingdon, 28-Sep-2025.) |
| Ref | Expression |
|---|---|
| cndsex | ⊢ (abs ∘ − ) ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-abs 11688 | . . 3 ⊢ abs = (𝑥 ∈ ℂ ↦ (√‘(𝑥 · (∗‘𝑥)))) | |
| 2 | cnex 8253 | . . . 4 ⊢ ℂ ∈ V | |
| 3 | 2 | mptex 5914 | . . 3 ⊢ (𝑥 ∈ ℂ ↦ (√‘(𝑥 · (∗‘𝑥)))) ∈ V |
| 4 | 1, 3 | eqeltri 2307 | . 2 ⊢ abs ∈ V |
| 5 | df-sub 8448 | . . 3 ⊢ − = (𝑥 ∈ ℂ, 𝑦 ∈ ℂ ↦ (℩𝑧 ∈ ℂ (𝑦 + 𝑧) = 𝑥)) | |
| 6 | 2, 2 | mpoex 6412 | . . 3 ⊢ (𝑥 ∈ ℂ, 𝑦 ∈ ℂ ↦ (℩𝑧 ∈ ℂ (𝑦 + 𝑧) = 𝑥)) ∈ V |
| 7 | 5, 6 | eqeltri 2307 | . 2 ⊢ − ∈ V |
| 8 | 4, 7 | coex 5310 | 1 ⊢ (abs ∘ − ) ∈ V |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1398 ∈ wcel 2205 Vcvv 2815 ↦ cmpt 4173 ∘ ccom 4755 ‘cfv 5354 ℩crio 6004 (class class class)co 6052 ∈ cmpo 6054 ℂcc 8127 + caddc 8132 · cmul 8134 − cmin 8446 ∗ccj 11528 √csqrt 11685 abscabs 11686 |
| 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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2207 ax-14 2208 ax-ext 2216 ax-coll 4227 ax-sep 4230 ax-pow 4289 ax-pr 4324 ax-un 4556 ax-cnex 8220 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-nf 1510 df-sb 1812 df-eu 2085 df-mo 2086 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ral 2527 df-rex 2528 df-reu 2529 df-rab 2531 df-v 2817 df-sbc 3045 df-csb 3141 df-un 3217 df-in 3219 df-ss 3226 df-pw 3673 df-sn 3697 df-pr 3698 df-op 3700 df-uni 3917 df-iun 3995 df-br 4112 df-opab 4174 df-mpt 4175 df-id 4416 df-xp 4757 df-rel 4758 df-cnv 4759 df-co 4760 df-dm 4761 df-rn 4762 df-res 4763 df-ima 4764 df-iota 5314 df-fun 5356 df-fn 5357 df-f 5358 df-f1 5359 df-fo 5360 df-f1o 5361 df-fv 5362 df-oprab 6056 df-mpo 6057 df-1st 6336 df-2nd 6337 df-sub 8448 df-abs 11688 |
| This theorem is referenced by: cntopex 14719 cnfldstr 14723 cnfldds 14733 |
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