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| Mirrors > Home > ILE Home > Th. List > le0neg1 | GIF version | ||
| Description: Comparison of a number and its negative to zero. (Contributed by NM, 10-May-2004.) |
| Ref | Expression |
|---|---|
| le0neg1 | ⊢ (𝐴 ∈ ℝ → (𝐴 ≤ 0 ↔ 0 ≤ -𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0re 8107 | . . 3 ⊢ 0 ∈ ℝ | |
| 2 | leneg 8573 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 0 ∈ ℝ) → (𝐴 ≤ 0 ↔ -0 ≤ -𝐴)) | |
| 3 | 1, 2 | mpan2 425 | . 2 ⊢ (𝐴 ∈ ℝ → (𝐴 ≤ 0 ↔ -0 ≤ -𝐴)) |
| 4 | neg0 8353 | . . 3 ⊢ -0 = 0 | |
| 5 | 4 | breq1i 4066 | . 2 ⊢ (-0 ≤ -𝐴 ↔ 0 ≤ -𝐴) |
| 6 | 3, 5 | bitrdi 196 | 1 ⊢ (𝐴 ∈ ℝ → (𝐴 ≤ 0 ↔ 0 ≤ -𝐴)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ↔ wb 105 ∈ wcel 2178 class class class wbr 4059 ℝcr 7959 0cc0 7960 ≤ cle 8143 -cneg 8279 |
| 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 4178 ax-pow 4234 ax-pr 4269 ax-un 4498 ax-setind 4603 ax-cnex 8051 ax-resscn 8052 ax-1cn 8053 ax-1re 8054 ax-icn 8055 ax-addcl 8056 ax-addrcl 8057 ax-mulcl 8058 ax-addcom 8060 ax-addass 8062 ax-distr 8064 ax-i2m1 8065 ax-0id 8068 ax-rnegex 8069 ax-cnre 8071 ax-pre-ltadd 8076 |
| 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 2778 df-sbc 3006 df-dif 3176 df-un 3178 df-in 3180 df-ss 3187 df-pw 3628 df-sn 3649 df-pr 3650 df-op 3652 df-uni 3865 df-br 4060 df-opab 4122 df-id 4358 df-xp 4699 df-rel 4700 df-cnv 4701 df-co 4702 df-dm 4703 df-iota 5251 df-fun 5292 df-fv 5298 df-riota 5922 df-ov 5970 df-oprab 5971 df-mpo 5972 df-pnf 8144 df-mnf 8145 df-xr 8146 df-ltxr 8147 df-le 8148 df-sub 8280 df-neg 8281 |
| This theorem is referenced by: le0neg1d 8625 zzlesq 10890 absnid 11499 |
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