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| Mirrors > Home > ILE Home > Th. List > leneg | GIF version | ||
| Description: Negative of both sides of 'less than or equal to'. (Contributed by NM, 12-Sep-1999.) (Proof shortened by Mario Carneiro, 27-May-2016.) |
| Ref | Expression |
|---|---|
| leneg | ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 ≤ 𝐵 ↔ -𝐵 ≤ -𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0re 8109 | . . 3 ⊢ 0 ∈ ℝ | |
| 2 | lesub2 8567 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 0 ∈ ℝ) → (𝐴 ≤ 𝐵 ↔ (0 − 𝐵) ≤ (0 − 𝐴))) | |
| 3 | 1, 2 | mp3an3 1339 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 ≤ 𝐵 ↔ (0 − 𝐵) ≤ (0 − 𝐴))) |
| 4 | df-neg 8283 | . . 3 ⊢ -𝐵 = (0 − 𝐵) | |
| 5 | df-neg 8283 | . . 3 ⊢ -𝐴 = (0 − 𝐴) | |
| 6 | 4, 5 | breq12i 4069 | . 2 ⊢ (-𝐵 ≤ -𝐴 ↔ (0 − 𝐵) ≤ (0 − 𝐴)) |
| 7 | 3, 6 | bitr4di 198 | 1 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 ≤ 𝐵 ↔ -𝐵 ≤ -𝐴)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 ∈ wcel 2178 class class class wbr 4060 (class class class)co 5969 ℝcr 7961 0cc0 7962 ≤ cle 8145 − cmin 8280 -cneg 8281 |
| 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 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-13 2180 ax-14 2181 ax-ext 2189 ax-sep 4179 ax-pow 4235 ax-pr 4270 ax-un 4499 ax-setind 4604 ax-cnex 8053 ax-resscn 8054 ax-1cn 8055 ax-1re 8056 ax-icn 8057 ax-addcl 8058 ax-addrcl 8059 ax-mulcl 8060 ax-addcom 8062 ax-addass 8064 ax-distr 8066 ax-i2m1 8067 ax-0id 8070 ax-rnegex 8071 ax-cnre 8073 ax-pre-ltadd 8078 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-fal 1379 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2194 df-cleq 2200 df-clel 2203 df-nfc 2339 df-ne 2379 df-nel 2474 df-ral 2491 df-rex 2492 df-reu 2493 df-rab 2495 df-v 2779 df-sbc 3007 df-dif 3177 df-un 3179 df-in 3181 df-ss 3188 df-pw 3629 df-sn 3650 df-pr 3651 df-op 3653 df-uni 3866 df-br 4061 df-opab 4123 df-id 4359 df-xp 4700 df-rel 4701 df-cnv 4702 df-co 4703 df-dm 4704 df-iota 5252 df-fun 5293 df-fv 5299 df-riota 5924 df-ov 5972 df-oprab 5973 df-mpo 5974 df-pnf 8146 df-mnf 8147 df-xr 8148 df-ltxr 8149 df-le 8150 df-sub 8282 df-neg 8283 |
| This theorem is referenced by: lenegcon1 8576 lenegcon2 8577 le0neg1 8580 le0neg2 8581 lenegi 8604 lenegd 8634 uzneg 9704 iccneg 10148 minclpr 11709 mingeb 11714 |
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