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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 8372 | . 2 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℝ*) | |
| 2 | rexr 8372 | . 2 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ ℝ*) | |
| 3 | xrlenlt 8391 | . 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 8179 ℝ*cxr 8360 < clt 8361 ≤ cle 8362 |
| 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 8365 df-le 8367 |
| This theorem is used by: letri3 8407 ltleletr 8408 letr 8409 leid 8410 eqlelt 8413 ltle 8414 lelttr 8415 ltletr 8416 lenlti 8428 lenltd 8446 lemul1 8924 msqge0 8947 mulge0 8950 ltleap 8963 recgt0 9183 lediv1 9202 dfinfre 9289 nnge1 9330 nnnlt1 9333 avgle1 9551 avgle2 9552 nn0nlt0 9594 zltnle 9695 zleloe 9696 zdcle 9726 recnz 9744 btwnnz 9745 prime 9750 fznlem 10456 nelfzo 10570 fzonlt0 10587 qltnle 10689 bcval4 11206 ccatsymb 11386 swrd0g 11448 resqrexlemgt0 11802 climge0 12110 infpnlem1 13161 efle 15968 logleb 16069 cxple 16114 cxple3 16118 birthdaylem3 16188 ppiqeq0 16241 lgsval2lem 16295 lgsneg 16309 lgsdilem 16312 gausslemma2dlem1a 16343 gausslemma2dlem3 16348 lealltlt1 16917 lealltlt2 16918 supfz 17288 inffz 17289 |
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