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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 8427 lenltd 8445 lemul1 8923 msqge0 8946 mulge0 8949 ltleap 8962 recgt0 9182 lediv1 9201 dfinfre 9288 nnge1 9329 nnnlt1 9332 avgle1 9550 avgle2 9551 nn0nlt0 9593 zltnle 9694 zleloe 9695 zdcle 9725 recnz 9743 btwnnz 9744 prime 9749 fznlem 10455 nelfzo 10569 fzonlt0 10586 qltnle 10688 bcval4 11204 ccatsymb 11384 swrd0g 11446 resqrexlemgt0 11800 climge0 12107 infpnlem1 13158 efle 15926 logleb 16027 cxple 16072 cxple3 16076 birthdaylem3 16146 ppiqeq0 16182 lgsval2lem 16227 lgsneg 16241 lgsdilem 16244 gausslemma2dlem1a 16275 gausslemma2dlem3 16280 lealltlt1 16849 lealltlt2 16850 supfz 17219 inffz 17220 |
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