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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 11788 | . . 3 ⊢ abs = (𝑥 ∈ ℂ ↦ (√‘(𝑥 · (∗‘𝑥)))) | |
| 2 | cnex 8310 | . . . 4 ⊢ ℂ ∈ V | |
| 3 | 2 | mptex 5946 | . . 3 ⊢ (𝑥 ∈ ℂ ↦ (√‘(𝑥 · (∗‘𝑥)))) ∈ V |
| 4 | 1, 3 | eqeltri 2311 | . 2 ⊢ abs ∈ V |
| 5 | df-sub 8507 | . . 3 ⊢ − = (𝑥 ∈ ℂ, 𝑦 ∈ ℂ ↦ (℩𝑧 ∈ ℂ (𝑦 + 𝑧) = 𝑥)) | |
| 6 | 2, 2 | mpoex 6454 | . . 3 ⊢ (𝑥 ∈ ℂ, 𝑦 ∈ ℂ ↦ (℩𝑧 ∈ ℂ (𝑦 + 𝑧) = 𝑥)) ∈ V |
| 7 | 5, 6 | eqeltri 2311 | . 2 ⊢ − ∈ V |
| 8 | 4, 7 | coex 5336 | 1 ⊢ (abs ∘ − ) ∈ V |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: = wceq 1402 ∈ wcel 2209 Vcvv 2821 ↦ cmpt 4193 ∘ ccom 4780 ‘cfv 5380 ℩crio 6040 (class class class)co 6088 ∈ cmpo 6090 ℂcc 8184 + caddc 8189 · cmul 8191 − cmin 8505 ∗ccj 11627 √csqrt 11785 abscabs 11786 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-coll 4248 ax-sep 4251 ax-pow 4313 ax-pr 4348 ax-un 4580 ax-cnex 8277 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-reu 2535 df-rab 2537 df-v 2823 df-sbc 3052 df-csb 3148 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-iun 4014 df-br 4132 df-opab 4194 df-mpt 4195 df-id 4440 df-xp 4782 df-rel 4783 df-cnv 4784 df-co 4785 df-dm 4786 df-rn 4787 df-res 4788 df-ima 4789 df-iota 5340 df-fun 5382 df-fn 5383 df-f 5384 df-f1 5385 df-fo 5386 df-f1o 5387 df-fv 5388 df-oprab 6092 df-mpo 6093 df-1st 6378 df-2nd 6379 df-sub 8507 df-abs 11788 |
| This theorem is used by: cntopex 15001 cnfldstr 15005 cnfldds 15015 |
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