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Mirrors > Home > ILE Home > Th. List > xltneg | GIF version |
Description: Extended real version of ltneg 8381. (Contributed by Mario Carneiro, 20-Aug-2015.) |
Ref | Expression |
---|---|
xltneg | ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (𝐴 < 𝐵 ↔ -𝑒𝐵 < -𝑒𝐴)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | xltnegi 9792 | . . 3 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ* ∧ 𝐴 < 𝐵) → -𝑒𝐵 < -𝑒𝐴) | |
2 | 1 | 3expia 1200 | . 2 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (𝐴 < 𝐵 → -𝑒𝐵 < -𝑒𝐴)) |
3 | xnegcl 9789 | . . . 4 ⊢ (𝐵 ∈ ℝ* → -𝑒𝐵 ∈ ℝ*) | |
4 | xnegcl 9789 | . . . 4 ⊢ (𝐴 ∈ ℝ* → -𝑒𝐴 ∈ ℝ*) | |
5 | xltnegi 9792 | . . . . 5 ⊢ ((-𝑒𝐵 ∈ ℝ* ∧ -𝑒𝐴 ∈ ℝ* ∧ -𝑒𝐵 < -𝑒𝐴) → -𝑒-𝑒𝐴 < -𝑒-𝑒𝐵) | |
6 | 5 | 3expia 1200 | . . . 4 ⊢ ((-𝑒𝐵 ∈ ℝ* ∧ -𝑒𝐴 ∈ ℝ*) → (-𝑒𝐵 < -𝑒𝐴 → -𝑒-𝑒𝐴 < -𝑒-𝑒𝐵)) |
7 | 3, 4, 6 | syl2anr 288 | . . 3 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (-𝑒𝐵 < -𝑒𝐴 → -𝑒-𝑒𝐴 < -𝑒-𝑒𝐵)) |
8 | xnegneg 9790 | . . . 4 ⊢ (𝐴 ∈ ℝ* → -𝑒-𝑒𝐴 = 𝐴) | |
9 | xnegneg 9790 | . . . 4 ⊢ (𝐵 ∈ ℝ* → -𝑒-𝑒𝐵 = 𝐵) | |
10 | 8, 9 | breqan12d 4005 | . . 3 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (-𝑒-𝑒𝐴 < -𝑒-𝑒𝐵 ↔ 𝐴 < 𝐵)) |
11 | 7, 10 | sylibd 148 | . 2 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (-𝑒𝐵 < -𝑒𝐴 → 𝐴 < 𝐵)) |
12 | 2, 11 | impbid 128 | 1 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (𝐴 < 𝐵 ↔ -𝑒𝐵 < -𝑒𝐴)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ↔ wb 104 ∈ wcel 2141 class class class wbr 3989 ℝ*cxr 7953 < clt 7954 -𝑒cxne 9726 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 609 ax-in2 610 ax-io 704 ax-5 1440 ax-7 1441 ax-gen 1442 ax-ie1 1486 ax-ie2 1487 ax-8 1497 ax-10 1498 ax-11 1499 ax-i12 1500 ax-bndl 1502 ax-4 1503 ax-17 1519 ax-i9 1523 ax-ial 1527 ax-i5r 1528 ax-13 2143 ax-14 2144 ax-ext 2152 ax-sep 4107 ax-pow 4160 ax-pr 4194 ax-un 4418 ax-setind 4521 ax-cnex 7865 ax-resscn 7866 ax-1cn 7867 ax-1re 7868 ax-icn 7869 ax-addcl 7870 ax-addrcl 7871 ax-mulcl 7872 ax-addcom 7874 ax-addass 7876 ax-distr 7878 ax-i2m1 7879 ax-0id 7882 ax-rnegex 7883 ax-cnre 7885 ax-pre-ltadd 7890 |
This theorem depends on definitions: df-bi 116 df-3or 974 df-3an 975 df-tru 1351 df-fal 1354 df-nf 1454 df-sb 1756 df-eu 2022 df-mo 2023 df-clab 2157 df-cleq 2163 df-clel 2166 df-nfc 2301 df-ne 2341 df-nel 2436 df-ral 2453 df-rex 2454 df-reu 2455 df-rab 2457 df-v 2732 df-sbc 2956 df-dif 3123 df-un 3125 df-in 3127 df-ss 3134 df-if 3527 df-pw 3568 df-sn 3589 df-pr 3590 df-op 3592 df-uni 3797 df-br 3990 df-opab 4051 df-id 4278 df-xp 4617 df-rel 4618 df-cnv 4619 df-co 4620 df-dm 4621 df-iota 5160 df-fun 5200 df-fv 5206 df-riota 5809 df-ov 5856 df-oprab 5857 df-mpo 5858 df-pnf 7956 df-mnf 7957 df-xr 7958 df-ltxr 7959 df-sub 8092 df-neg 8093 df-xneg 9729 |
This theorem is referenced by: xleneg 9794 xlt0neg1 9795 xlt0neg2 9796 xrnegiso 11225 xrminmax 11228 xrltmininf 11233 xrminltinf 11235 |
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