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| Mirrors > Home > ILE Home > Th. List > lenlt | GIF version | ||
| Description: 'Less than or equal to' expressed in terms of 'less than'. Part of definition 11.2.7(vi) of [HoTT], p. (varies). (Contributed by NM, 13-May-1999.) |
| Ref | Expression |
|---|---|
| lenlt | ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 ≤ 𝐵 ↔ ¬ 𝐵 < 𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | rexr 8361 | . 2 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℝ*) | |
| 2 | rexr 8361 | . 2 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ ℝ*) | |
| 3 | xrlenlt 8380 | . 2 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (𝐴 ≤ 𝐵 ↔ ¬ 𝐵 < 𝐴)) | |
| 4 | 1, 2, 3 | syl2an 289 | 1 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 ≤ 𝐵 ↔ ¬ 𝐵 < 𝐴)) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 104 ↔ wb 105 ∈ wcel 2209 class class class wbr 4125 ℝcr 8168 ℝ*cxr 8349 < clt 8350 ≤ cle 8351 |
| 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 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 4244 ax-pow 4306 ax-pr 4341 |
| This theorem 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 3687 df-sn 3711 df-pr 3712 df-op 3714 df-br 4126 df-opab 4188 df-xp 4775 df-cnv 4777 df-xr 8354 df-le 8356 |
| This theorem is referenced by: letri3 8396 ltleletr 8397 letr 8398 leid 8399 eqlelt 8402 ltle 8403 lelttr 8404 ltletr 8405 lenlti 8416 lenltd 8434 lemul1 8911 msqge0 8934 mulge0 8937 ltleap 8950 recgt0 9170 lediv1 9189 dfinfre 9276 nnge1 9306 nnnlt1 9309 avgle1 9525 avgle2 9526 nn0nlt0 9568 zltnle 9669 zleloe 9670 zdcle 9700 recnz 9718 btwnnz 9719 prime 9724 fznlem 10424 nelfzo 10537 fzonlt0 10554 qltnle 10656 bcval4 11168 ccatsymb 11348 swrd0g 11410 resqrexlemgt0 11764 climge0 12069 infpnlem1 13116 efle 15800 logleb 15899 cxple 15942 cxple3 15946 lgsval2lem 16043 lgsneg 16057 lgsdilem 16060 gausslemma2dlem1a 16091 gausslemma2dlem3 16096 lealltlt1 16665 lealltlt2 16666 supfz 17026 inffz 17027 |
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