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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 8401 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 ≤ 𝐵 ↔ ¬ 𝐵 < 𝐴)) | |
| 4 | 1, 2, 3 | syl2anc 415 | 1 ⊢ (𝜑 → (𝐴 ≤ 𝐵 ↔ ¬ 𝐵 < 𝐴)) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ↔ wb 105 ∈ wcel 2209 class class class wbr 4130 ℝcr 8178 < clt 8360 ≤ cle 8361 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4249 ax-pow 4311 ax-pr 4346 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-v 2823 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-br 4131 df-opab 4193 df-xp 4780 df-cnv 4782 df-xr 8364 df-le 8366 |
| This theorem is used by: ltnsymd 8447 nltled 8448 lensymd 8449 leadd1 8759 lemul1 8923 leltap 8955 ap0gt0 8970 prodgt0 9184 prodge0 9186 lediv1 9201 lemuldiv 9213 lerec 9216 lt2msq 9218 le2msq 9233 squeeze0 9236 suprleubex 9286 0mnnnnn0 9599 elnn0z 9661 uzm1 9962 infregelbex 10007 fztri3or 10453 fzdisj 10467 uzdisj 10510 nn0disj 10555 fzouzdisj 10599 elfzonelfzo 10658 qdcle 10691 flqeqceilz 10768 modifeq2int 10836 modsumfzodifsn 10846 nn0leexp2 11162 expcanlem 11167 fimaxq 11284 hashf1 11301 swrdccatin2 11515 resqrexlemoverl 11801 leabs 11854 absle 11870 maxleast 11994 minmax 12011 climge0 12107 pcfac 13149 logdivlt 16046 logdivle 16047 cxple 16072 gausslemma2dlem1a 16275 |
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