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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 8267 | . 2 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℝ*) | |
| 2 | rexr 8267 | . 2 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ ℝ*) | |
| 3 | xrlenlt 8286 | . 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 2202 class class class wbr 4093 ℝcr 8074 ℝ*cxr 8255 < clt 8256 ≤ cle 8257 |
| 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-14 2205 ax-ext 2213 ax-sep 4212 ax-pow 4270 ax-pr 4305 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-nf 1510 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ral 2516 df-rex 2517 df-v 2805 df-dif 3203 df-un 3205 df-in 3207 df-ss 3214 df-pw 3658 df-sn 3679 df-pr 3680 df-op 3682 df-br 4094 df-opab 4156 df-xp 4737 df-cnv 4739 df-xr 8260 df-le 8262 |
| This theorem is referenced by: letri3 8302 ltleletr 8303 letr 8304 leid 8305 eqlelt 8308 ltle 8309 lelttr 8310 ltletr 8311 lenlti 8322 lenltd 8339 lemul1 8815 msqge0 8838 mulge0 8841 ltleap 8854 recgt0 9072 lediv1 9091 dfinfre 9178 nnge1 9208 nnnlt1 9211 avgle1 9427 avgle2 9428 nn0nlt0 9470 zltnle 9569 zleloe 9570 zdcle 9600 recnz 9617 btwnnz 9618 prime 9623 fznlem 10321 nelfzo 10432 fzonlt0 10449 qltnle 10549 bcval4 11060 ccatsymb 11228 swrd0g 11290 resqrexlemgt0 11643 climge0 11948 infpnlem1 12995 efle 15570 logleb 15669 cxple 15711 cxple3 15715 lgsval2lem 15812 lgsneg 15826 lgsdilem 15829 gausslemma2dlem1a 15860 gausslemma2dlem3 15865 supfz 16787 inffz 16788 |
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