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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 8203 | . 2 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℝ*) | |
| 2 | rexr 8203 | . 2 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ ℝ*) | |
| 3 | xrlenlt 8222 | . 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 2200 class class class wbr 4083 ℝcr 8009 ℝ*cxr 8191 < clt 8192 ≤ cle 8193 |
| 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 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-14 2203 ax-ext 2211 ax-sep 4202 ax-pow 4258 ax-pr 4293 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ral 2513 df-rex 2514 df-v 2801 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-br 4084 df-opab 4146 df-xp 4725 df-cnv 4727 df-xr 8196 df-le 8198 |
| This theorem is referenced by: letri3 8238 ltleletr 8239 letr 8240 leid 8241 eqlelt 8244 ltle 8245 lelttr 8246 ltletr 8247 lenlti 8258 lenltd 8275 lemul1 8751 msqge0 8774 mulge0 8777 ltleap 8790 recgt0 9008 lediv1 9027 dfinfre 9114 nnge1 9144 nnnlt1 9147 avgle1 9363 avgle2 9364 nn0nlt0 9406 zltnle 9503 zleloe 9504 zdcle 9534 recnz 9551 btwnnz 9552 prime 9557 fznlem 10249 nelfzo 10360 fzonlt0 10377 qltnle 10475 bcval4 10986 ccatsymb 11150 swrd0g 11207 resqrexlemgt0 11546 climge0 11851 infpnlem1 12897 efle 15465 logleb 15564 cxple 15606 cxple3 15610 lgsval2lem 15704 lgsneg 15718 lgsdilem 15721 gausslemma2dlem1a 15752 gausslemma2dlem3 15757 supfz 16499 inffz 16500 |
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