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Mirrors > Home > ILE Home > Th. List > lenltd | GIF version |
Description: 'Less than or equal to' in terms of 'less than'. (Contributed by Mario Carneiro, 27-May-2016.) |
Ref | Expression |
---|---|
ltd.1 | ⊢ (𝜑 → 𝐴 ∈ ℝ) |
ltd.2 | ⊢ (𝜑 → 𝐵 ∈ ℝ) |
Ref | Expression |
---|---|
lenltd | ⊢ (𝜑 → (𝐴 ≤ 𝐵 ↔ ¬ 𝐵 < 𝐴)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ltd.1 | . 2 ⊢ (𝜑 → 𝐴 ∈ ℝ) | |
2 | ltd.2 | . 2 ⊢ (𝜑 → 𝐵 ∈ ℝ) | |
3 | lenlt 7711 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 ≤ 𝐵 ↔ ¬ 𝐵 < 𝐴)) | |
4 | 1, 2, 3 | syl2anc 406 | 1 ⊢ (𝜑 → (𝐴 ≤ 𝐵 ↔ ¬ 𝐵 < 𝐴)) |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 104 ∈ wcel 1448 class class class wbr 3875 ℝcr 7499 < clt 7672 ≤ cle 7673 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 584 ax-in2 585 ax-io 671 ax-5 1391 ax-7 1392 ax-gen 1393 ax-ie1 1437 ax-ie2 1438 ax-8 1450 ax-10 1451 ax-11 1452 ax-i12 1453 ax-bndl 1454 ax-4 1455 ax-14 1460 ax-17 1474 ax-i9 1478 ax-ial 1482 ax-i5r 1483 ax-ext 2082 ax-sep 3986 ax-pow 4038 ax-pr 4069 |
This theorem depends on definitions: df-bi 116 df-3an 932 df-tru 1302 df-nf 1405 df-sb 1704 df-eu 1963 df-mo 1964 df-clab 2087 df-cleq 2093 df-clel 2096 df-nfc 2229 df-ral 2380 df-rex 2381 df-v 2643 df-dif 3023 df-un 3025 df-in 3027 df-ss 3034 df-pw 3459 df-sn 3480 df-pr 3481 df-op 3483 df-br 3876 df-opab 3930 df-xp 4483 df-cnv 4485 df-xr 7676 df-le 7678 |
This theorem is referenced by: ltnsymd 7753 nltled 7754 lensymd 7755 leadd1 8059 lemul1 8221 leltap 8253 ap0gt0 8267 prodgt0 8468 prodge0 8470 lediv1 8485 lemuldiv 8497 lerec 8500 lt2msq 8502 le2msq 8517 squeeze0 8520 suprleubex 8570 0mnnnnn0 8861 elnn0z 8919 uzm1 9206 fztri3or 9660 fzdisj 9673 uzdisj 9714 nn0disj 9756 fzouzdisj 9798 elfzonelfzo 9848 flqeqceilz 9932 modifeq2int 10000 modsumfzodifsn 10010 expcanlem 10303 fimaxq 10414 resqrexlemoverl 10633 leabs 10686 absle 10701 maxleast 10825 minmax 10840 climge0 10933 efler 11203 |
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