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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 5100 | . . 3 ⊢ ((𝑥 = 𝐴 ∧ 𝑦 = 𝐵) → (𝑥 ≤ 𝑦 ↔ 𝐴 ≤ 𝐵)) | |
| 2 | id 22 | . . . 4 ⊢ (𝑦 = 𝐵 → 𝑦 = 𝐵) | |
| 3 | xnegeq 13113 | . . . 4 ⊢ (𝑥 = 𝐴 → -𝑒𝑥 = -𝑒𝐴) | |
| 4 | 2, 3 | oveqan12rd 7375 | . . 3 ⊢ ((𝑥 = 𝐴 ∧ 𝑦 = 𝐵) → (𝑦 +𝑒 -𝑒𝑥) = (𝐵 +𝑒 -𝑒𝐴)) |
| 5 | id 22 | . . . 4 ⊢ (𝑥 = 𝐴 → 𝑥 = 𝐴) | |
| 6 | xnegeq 13113 | . . . 4 ⊢ (𝑦 = 𝐵 → -𝑒𝑦 = -𝑒𝐵) | |
| 7 | 5, 6 | oveqan12d 7374 | . . 3 ⊢ ((𝑥 = 𝐴 ∧ 𝑦 = 𝐵) → (𝑥 +𝑒 -𝑒𝑦) = (𝐴 +𝑒 -𝑒𝐵)) |
| 8 | 1, 4, 7 | ifbieq12d 4505 | . 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 21355 | . 2 ⊢ 𝐷 = (𝑥 ∈ ℝ*, 𝑦 ∈ ℝ* ↦ if(𝑥 ≤ 𝑦, (𝑦 +𝑒 -𝑒𝑥), (𝑥 +𝑒 -𝑒𝑦))) |
| 11 | ovex 7388 | . . 3 ⊢ (𝐵 +𝑒 -𝑒𝐴) ∈ V | |
| 12 | ovex 7388 | . . 3 ⊢ (𝐴 +𝑒 -𝑒𝐵) ∈ V | |
| 13 | 11, 12 | ifex 4527 | . 2 ⊢ if(𝐴 ≤ 𝐵, (𝐵 +𝑒 -𝑒𝐴), (𝐴 +𝑒 -𝑒𝐵)) ∈ V |
| 14 | 8, 10, 13 | ovmpoa 7510 | 1 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (𝐴𝐷𝐵) = if(𝐴 ≤ 𝐵, (𝐵 +𝑒 -𝑒𝐴), (𝐴 +𝑒 -𝑒𝐵))) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1541 ∈ wcel 2113 ifcif 4476 class class class wbr 5095 ‘cfv 6489 (class class class)co 7355 ℝ*cxr 11156 ≤ cle 11158 -𝑒cxne 13014 +𝑒 cxad 13015 distcds 17177 ℝ*𝑠cxrs 17412 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2182 ax-ext 2705 ax-sep 5238 ax-nul 5248 ax-pow 5307 ax-pr 5374 ax-un 7677 ax-cnex 11073 ax-resscn 11074 ax-1cn 11075 ax-icn 11076 ax-addcl 11077 ax-addrcl 11078 ax-mulcl 11079 ax-mulrcl 11080 ax-mulcom 11081 ax-addass 11082 ax-mulass 11083 ax-distr 11084 ax-i2m1 11085 ax-1ne0 11086 ax-1rid 11087 ax-rnegex 11088 ax-rrecex 11089 ax-cnre 11090 ax-pre-lttri 11091 ax-pre-lttrn 11092 ax-pre-ltadd 11093 ax-pre-mulgt0 11094 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2537 df-eu 2566 df-clab 2712 df-cleq 2725 df-clel 2808 df-nfc 2882 df-ne 2930 df-nel 3034 df-ral 3049 df-rex 3058 df-reu 3348 df-rab 3397 df-v 3439 df-sbc 3738 df-csb 3847 df-dif 3901 df-un 3903 df-in 3905 df-ss 3915 df-pss 3918 df-nul 4283 df-if 4477 df-pw 4553 df-sn 4578 df-pr 4580 df-tp 4582 df-op 4584 df-uni 4861 df-iun 4945 df-br 5096 df-opab 5158 df-mpt 5177 df-tr 5203 df-id 5516 df-eprel 5521 df-po 5529 df-so 5530 df-fr 5574 df-we 5576 df-xp 5627 df-rel 5628 df-cnv 5629 df-co 5630 df-dm 5631 df-rn 5632 df-res 5633 df-ima 5634 df-pred 6256 df-ord 6317 df-on 6318 df-lim 6319 df-suc 6320 df-iota 6445 df-fun 6491 df-fn 6492 df-f 6493 df-f1 6494 df-fo 6495 df-f1o 6496 df-fv 6497 df-riota 7312 df-ov 7358 df-oprab 7359 df-mpo 7360 df-om 7806 df-1st 7930 df-2nd 7931 df-frecs 8220 df-wrecs 8251 df-recs 8300 df-rdg 8338 df-1o 8394 df-er 8631 df-en 8880 df-dom 8881 df-sdom 8882 df-fin 8883 df-pnf 11159 df-mnf 11160 df-xr 11161 df-ltxr 11162 df-le 11163 df-sub 11357 df-neg 11358 df-nn 12137 df-2 12199 df-3 12200 df-4 12201 df-5 12202 df-6 12203 df-7 12204 df-8 12205 df-9 12206 df-n0 12393 df-z 12480 df-dec 12599 df-uz 12743 df-xneg 13017 df-xadd 13018 df-fz 13415 df-struct 17065 df-slot 17100 df-ndx 17112 df-base 17128 df-plusg 17181 df-mulr 17182 df-tset 17187 df-ple 17188 df-ds 17190 df-xrs 17414 |
| This theorem is referenced by: xrsdsreval 21357 xrsdsreclb 21359 xmetrtri2 24291 xrsxmet 24745 metdscn 24792 |
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