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| Mirrors > Home > MPE Home > Th. List > xrsdsval | Structured version Visualization version GIF version | ||
| Description: The metric of the extended real number structure. (Contributed by Mario Carneiro, 20-Aug-2015.) |
| Ref | Expression |
|---|---|
| xrsds.d | ⊢ 𝐷 = (dist‘ℝ*𝑠) |
| Ref | Expression |
|---|---|
| xrsdsval | ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (𝐴𝐷𝐵) = if(𝐴 ≤ 𝐵, (𝐵 +𝑒 -𝑒𝐴), (𝐴 +𝑒 -𝑒𝐵))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | breq12 5108 | . . 3 ⊢ ((𝑥 = 𝐴 ∧ 𝑦 = 𝐵) → (𝑥 ≤ 𝑦 ↔ 𝐴 ≤ 𝐵)) | |
| 2 | id 23 | . . . 4 ⊢ (𝑦 = 𝐵 → 𝑦 = 𝐵) | |
| 3 | xnegeq 13260 | . . . 4 ⊢ (𝑥 = 𝐴 → -𝑒𝑥 = -𝑒𝐴) | |
| 4 | 2, 3 | oveqan12rd 7434 | . . 3 ⊢ ((𝑥 = 𝐴 ∧ 𝑦 = 𝐵) → (𝑦 +𝑒 -𝑒𝑥) = (𝐵 +𝑒 -𝑒𝐴)) |
| 5 | id 23 | . . . 4 ⊢ (𝑥 = 𝐴 → 𝑥 = 𝐴) | |
| 6 | xnegeq 13260 | . . . 4 ⊢ (𝑦 = 𝐵 → -𝑒𝑦 = -𝑒𝐵) | |
| 7 | 5, 6 | oveqan12d 7433 | . . 3 ⊢ ((𝑥 = 𝐴 ∧ 𝑦 = 𝐵) → (𝑥 +𝑒 -𝑒𝑦) = (𝐴 +𝑒 -𝑒𝐵)) |
| 8 | 1, 4, 7 | ifbieq12d 4511 | . 2 ⊢ ((𝑥 = 𝐴 ∧ 𝑦 = 𝐵) → if(𝑥 ≤ 𝑦, (𝑦 +𝑒 -𝑒𝑥), (𝑥 +𝑒 -𝑒𝑦)) = if(𝐴 ≤ 𝐵, (𝐵 +𝑒 -𝑒𝐴), (𝐴 +𝑒 -𝑒𝐵))) |
| 9 | xrsds.d | . . 3 ⊢ 𝐷 = (dist‘ℝ*𝑠) | |
| 10 | 9 | xrsds 21624 | . 2 ⊢ 𝐷 = (𝑥 ∈ ℝ*, 𝑦 ∈ ℝ* ↦ if(𝑥 ≤ 𝑦, (𝑦 +𝑒 -𝑒𝑥), (𝑥 +𝑒 -𝑒𝑦))) |
| 11 | ovex 7447 | . . 3 ⊢ (𝐵 +𝑒 -𝑒𝐴) ∈ V | |
| 12 | ovex 7447 | . . 3 ⊢ (𝐴 +𝑒 -𝑒𝐵) ∈ V | |
| 13 | 11, 12 | ifex 4533 | . 2 ⊢ if(𝐴 ≤ 𝐵, (𝐵 +𝑒 -𝑒𝐴), (𝐴 +𝑒 -𝑒𝐵)) ∈ V |
| 14 | 8, 10, 13 | ovmpoa 7569 | 1 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (𝐴𝐷𝐵) = if(𝐴 ≤ 𝐵, (𝐵 +𝑒 -𝑒𝐴), (𝐴 +𝑒 -𝑒𝐵))) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 = wceq 1570 ∈ wcel 2145 ifcif 4482 class class class wbr 5103 ‘cfv 6533 (class class class)co 7414 ℝ*cxr 11267 ≤ cle 11269 -𝑒cxne 13161 +𝑒 cxad 13162 distcds 17352 ℝ*𝑠cxrs 17587 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-sep 5251 ax-nul 5263 ax-pow 5330 ax-pr 5398 ax-un 7737 ax-cnex 11181 ax-resscn 11182 ax-1cn 11183 ax-icn 11184 ax-addcl 11185 ax-addrcl 11186 ax-mulcl 11187 ax-mulrcl 11188 ax-mulcom 11189 ax-addass 11190 ax-mulass 11191 ax-distr 11192 ax-i2m1 11193 ax-1ne0 11194 ax-1rid 11195 ax-rnegex 11196 ax-rrecex 11197 ax-cnre 11198 ax-pre-lttri 11199 ax-pre-lttrn 11200 ax-pre-ltadd 11201 ax-pre-mulgt0 11202 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-tp 4589 df-op 4591 df-uni 4868 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-pred 6299 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-riota 7371 df-ov 7417 df-oprab 7418 df-mpo 7419 df-om 7864 df-1st 7987 df-2nd 7988 df-frecs 8281 df-wrecs 8312 df-recs 8361 df-rdg 8400 df-1o 8456 df-er 8697 df-en 8954 df-dom 8955 df-sdom 8956 df-fin 8957 df-pnf 11270 df-mnf 11271 df-xr 11272 df-ltxr 11273 df-le 11274 df-sub 11468 df-neg 11469 df-nn 12259 df-2 12328 df-3 12329 df-4 12330 df-5 12331 df-6 12332 df-7 12333 df-8 12334 df-9 12335 df-n0 12530 df-z 12617 df-dec 12738 df-uz 12889 df-xneg 13164 df-xadd 13165 df-fz 13563 df-struct 17240 df-slot 17275 df-ndx 17287 df-base 17303 df-plusg 17356 df-mulr 17357 df-tset 17362 df-ple 17363 df-ds 17365 df-xrs 17589 |
| This theorem is used by: xrsdsreval 21626 xrsdsreclb 21628 xmetrtri2 24583 xrsxmet 25037 metdscn 25084 |
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