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Mirrors > Home > ILE Home > Th. List > xnegneg | GIF version |
Description: Extended real version of negneg 8269. (Contributed by Mario Carneiro, 20-Aug-2015.) |
Ref | Expression |
---|---|
xnegneg | ⊢ (𝐴 ∈ ℝ* → -𝑒-𝑒𝐴 = 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elxr 9842 | . 2 ⊢ (𝐴 ∈ ℝ* ↔ (𝐴 ∈ ℝ ∨ 𝐴 = +∞ ∨ 𝐴 = -∞)) | |
2 | rexneg 9896 | . . . . 5 ⊢ (𝐴 ∈ ℝ → -𝑒𝐴 = -𝐴) | |
3 | xnegeq 9893 | . . . . 5 ⊢ (-𝑒𝐴 = -𝐴 → -𝑒-𝑒𝐴 = -𝑒-𝐴) | |
4 | 2, 3 | syl 14 | . . . 4 ⊢ (𝐴 ∈ ℝ → -𝑒-𝑒𝐴 = -𝑒-𝐴) |
5 | renegcl 8280 | . . . . 5 ⊢ (𝐴 ∈ ℝ → -𝐴 ∈ ℝ) | |
6 | rexneg 9896 | . . . . 5 ⊢ (-𝐴 ∈ ℝ → -𝑒-𝐴 = --𝐴) | |
7 | 5, 6 | syl 14 | . . . 4 ⊢ (𝐴 ∈ ℝ → -𝑒-𝐴 = --𝐴) |
8 | recn 8005 | . . . . 5 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℂ) | |
9 | 8 | negnegd 8321 | . . . 4 ⊢ (𝐴 ∈ ℝ → --𝐴 = 𝐴) |
10 | 4, 7, 9 | 3eqtrd 2230 | . . 3 ⊢ (𝐴 ∈ ℝ → -𝑒-𝑒𝐴 = 𝐴) |
11 | xnegmnf 9895 | . . . 4 ⊢ -𝑒-∞ = +∞ | |
12 | xnegeq 9893 | . . . . . 6 ⊢ (𝐴 = +∞ → -𝑒𝐴 = -𝑒+∞) | |
13 | xnegpnf 9894 | . . . . . 6 ⊢ -𝑒+∞ = -∞ | |
14 | 12, 13 | eqtrdi 2242 | . . . . 5 ⊢ (𝐴 = +∞ → -𝑒𝐴 = -∞) |
15 | xnegeq 9893 | . . . . 5 ⊢ (-𝑒𝐴 = -∞ → -𝑒-𝑒𝐴 = -𝑒-∞) | |
16 | 14, 15 | syl 14 | . . . 4 ⊢ (𝐴 = +∞ → -𝑒-𝑒𝐴 = -𝑒-∞) |
17 | id 19 | . . . 4 ⊢ (𝐴 = +∞ → 𝐴 = +∞) | |
18 | 11, 16, 17 | 3eqtr4a 2252 | . . 3 ⊢ (𝐴 = +∞ → -𝑒-𝑒𝐴 = 𝐴) |
19 | xnegeq 9893 | . . . . . 6 ⊢ (𝐴 = -∞ → -𝑒𝐴 = -𝑒-∞) | |
20 | 19, 11 | eqtrdi 2242 | . . . . 5 ⊢ (𝐴 = -∞ → -𝑒𝐴 = +∞) |
21 | xnegeq 9893 | . . . . 5 ⊢ (-𝑒𝐴 = +∞ → -𝑒-𝑒𝐴 = -𝑒+∞) | |
22 | 20, 21 | syl 14 | . . . 4 ⊢ (𝐴 = -∞ → -𝑒-𝑒𝐴 = -𝑒+∞) |
23 | id 19 | . . . 4 ⊢ (𝐴 = -∞ → 𝐴 = -∞) | |
24 | 13, 22, 23 | 3eqtr4a 2252 | . . 3 ⊢ (𝐴 = -∞ → -𝑒-𝑒𝐴 = 𝐴) |
25 | 10, 18, 24 | 3jaoi 1314 | . 2 ⊢ ((𝐴 ∈ ℝ ∨ 𝐴 = +∞ ∨ 𝐴 = -∞) → -𝑒-𝑒𝐴 = 𝐴) |
26 | 1, 25 | sylbi 121 | 1 ⊢ (𝐴 ∈ ℝ* → -𝑒-𝑒𝐴 = 𝐴) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∨ w3o 979 = wceq 1364 ∈ wcel 2164 ℝcr 7871 +∞cpnf 8051 -∞cmnf 8052 ℝ*cxr 8053 -cneg 8191 -𝑒cxne 9835 |
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-in1 615 ax-in2 616 ax-io 710 ax-5 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-10 1516 ax-11 1517 ax-i12 1518 ax-bndl 1520 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-13 2166 ax-14 2167 ax-ext 2175 ax-sep 4147 ax-pow 4203 ax-pr 4238 ax-un 4464 ax-setind 4569 ax-cnex 7963 ax-resscn 7964 ax-1cn 7965 ax-icn 7967 ax-addcl 7968 ax-addrcl 7969 ax-mulcl 7970 ax-addcom 7972 ax-addass 7974 ax-distr 7976 ax-i2m1 7977 ax-0id 7980 ax-rnegex 7981 ax-cnre 7983 |
This theorem depends on definitions: df-bi 117 df-3or 981 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1472 df-sb 1774 df-eu 2045 df-mo 2046 df-clab 2180 df-cleq 2186 df-clel 2189 df-nfc 2325 df-ne 2365 df-nel 2460 df-ral 2477 df-rex 2478 df-reu 2479 df-rab 2481 df-v 2762 df-sbc 2986 df-dif 3155 df-un 3157 df-in 3159 df-ss 3166 df-if 3558 df-pw 3603 df-sn 3624 df-pr 3625 df-op 3627 df-uni 3836 df-br 4030 df-opab 4091 df-id 4324 df-xp 4665 df-rel 4666 df-cnv 4667 df-co 4668 df-dm 4669 df-iota 5215 df-fun 5256 df-fv 5262 df-riota 5873 df-ov 5921 df-oprab 5922 df-mpo 5923 df-pnf 8056 df-mnf 8057 df-xr 8058 df-sub 8192 df-neg 8193 df-xneg 9838 |
This theorem is referenced by: xneg11 9900 xltneg 9902 xnegdi 9934 xnpcan 9938 xrnegiso 11405 infxrnegsupex 11406 xrnegcon1d 11407 xrminmax 11408 xrmin1inf 11410 xrmin2inf 11411 xrltmininf 11413 xrlemininf 11414 xrminltinf 11415 xrminadd 11418 |
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