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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 8377 | . 2 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℝ*) | |
| 2 | rexr 8377 | . 2 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ ℝ*) | |
| 3 | xrlenlt 8396 | . 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 |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∧ wa 104 ↔ wb 105 ∈ wcel 2209 class class class wbr 4131 ℝcr 8184 ℝ*cxr 8365 < clt 8366 ≤ cle 8367 |
| 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 4251 ax-pow 4313 ax-pr 4348 |
| 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 4132 df-opab 4194 df-xp 4782 df-cnv 4784 df-xr 8370 df-le 8372 |
| This theorem is used by: letri3 8412 ltleletr 8413 letr 8414 leid 8415 eqlelt 8418 ltle 8419 lelttr 8420 ltletr 8421 lenlti 8433 lenltd 8451 lemul1 8929 msqge0 8952 mulge0 8955 ltleap 8968 recgt0 9188 lediv1 9207 dfinfre 9294 nnge1 9336 nnnlt1 9339 avgle1 9557 avgle2 9558 nn0nlt0 9600 zltnle 9701 zleloe 9702 zdcle 9732 recnz 9750 btwnnz 9751 prime 9756 fznlem 10462 nelfzo 10576 fzonlt0 10593 qltnle 10695 bcval4 11212 ccatsymb 11392 swrd0g 11454 resqrexlemgt0 11808 climge0 12116 infpnlem1 13167 efle 16002 logleb 16105 cxple 16152 cxple3 16156 birthdaylem3 16227 ppiqeq0 16280 lgsval2lem 16334 lgsneg 16348 lgsdilem 16351 gausslemma2dlem1a 16382 gausslemma2dlem3 16387 lealltlt1 16956 lealltlt2 16957 supfz 17328 inffz 17329 |
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