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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 8371 | . 2 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℝ*) | |
| 2 | rexr 8371 | . 2 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ ℝ*) | |
| 3 | xrlenlt 8390 | . 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 4130 ℝcr 8178 ℝ*cxr 8359 < 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: letri3 8406 ltleletr 8407 letr 8408 leid 8409 eqlelt 8412 ltle 8413 lelttr 8414 ltletr 8415 lenlti 8426 lenltd 8444 lemul1 8921 msqge0 8944 mulge0 8947 ltleap 8960 recgt0 9180 lediv1 9199 dfinfre 9286 nnge1 9327 nnnlt1 9330 avgle1 9546 avgle2 9547 nn0nlt0 9589 zltnle 9690 zleloe 9691 zdcle 9721 recnz 9739 btwnnz 9740 prime 9745 fznlem 10445 nelfzo 10559 fzonlt0 10576 qltnle 10678 bcval4 11190 ccatsymb 11370 swrd0g 11432 resqrexlemgt0 11786 climge0 12091 infpnlem1 13138 efle 15877 logleb 15976 cxple 16019 cxple3 16023 birthdaylem3 16089 lgsval2lem 16129 lgsneg 16143 lgsdilem 16146 gausslemma2dlem1a 16177 gausslemma2dlem3 16182 lealltlt1 16751 lealltlt2 16752 supfz 17121 inffz 17122 |
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