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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 8319 | . 2 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℝ*) | |
| 2 | rexr 8319 | . 2 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ ℝ*) | |
| 3 | xrlenlt 8338 | . 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 2203 class class class wbr 4109 ℝcr 8126 ℝ*cxr 8307 < clt 8308 ≤ cle 8309 |
| 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-14 2206 ax-ext 2214 ax-sep 4228 ax-pow 4287 ax-pr 4322 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-nf 1510 df-sb 1812 df-eu 2083 df-mo 2084 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-ral 2525 df-rex 2526 df-v 2815 df-dif 3213 df-un 3215 df-in 3217 df-ss 3224 df-pw 3671 df-sn 3695 df-pr 3696 df-op 3698 df-br 4110 df-opab 4172 df-xp 4755 df-cnv 4757 df-xr 8312 df-le 8314 |
| This theorem is referenced by: letri3 8354 ltleletr 8355 letr 8356 leid 8357 eqlelt 8360 ltle 8361 lelttr 8362 ltletr 8363 lenlti 8374 lenltd 8391 lemul1 8867 msqge0 8890 mulge0 8893 ltleap 8906 recgt0 9124 lediv1 9143 dfinfre 9230 nnge1 9260 nnnlt1 9263 avgle1 9479 avgle2 9480 nn0nlt0 9522 zltnle 9623 zleloe 9624 zdcle 9654 recnz 9671 btwnnz 9672 prime 9677 fznlem 10375 nelfzo 10486 fzonlt0 10503 qltnle 10603 bcval4 11114 ccatsymb 11290 swrd0g 11352 resqrexlemgt0 11705 climge0 12010 infpnlem1 13057 efle 15641 logleb 15740 cxple 15782 cxple3 15786 lgsval2lem 15883 lgsneg 15897 lgsdilem 15900 gausslemma2dlem1a 15931 gausslemma2dlem3 15936 supfz 16857 inffz 16858 |
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