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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 8215 | . 2 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℝ*) | |
| 2 | rexr 8215 | . 2 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ ℝ*) | |
| 3 | xrlenlt 8234 | . 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 4086 ℝcr 8021 ℝ*cxr 8203 < clt 8204 ≤ cle 8205 |
| 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 4205 ax-pow 4262 ax-pr 4297 |
| 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 2802 df-dif 3200 df-un 3202 df-in 3204 df-ss 3211 df-pw 3652 df-sn 3673 df-pr 3674 df-op 3676 df-br 4087 df-opab 4149 df-xp 4729 df-cnv 4731 df-xr 8208 df-le 8210 |
| This theorem is referenced by: letri3 8250 ltleletr 8251 letr 8252 leid 8253 eqlelt 8256 ltle 8257 lelttr 8258 ltletr 8259 lenlti 8270 lenltd 8287 lemul1 8763 msqge0 8786 mulge0 8789 ltleap 8802 recgt0 9020 lediv1 9039 dfinfre 9126 nnge1 9156 nnnlt1 9159 avgle1 9375 avgle2 9376 nn0nlt0 9418 zltnle 9515 zleloe 9516 zdcle 9546 recnz 9563 btwnnz 9564 prime 9569 fznlem 10266 nelfzo 10377 fzonlt0 10394 qltnle 10493 bcval4 11004 ccatsymb 11169 swrd0g 11231 resqrexlemgt0 11571 climge0 11876 infpnlem1 12922 efle 15490 logleb 15589 cxple 15631 cxple3 15635 lgsval2lem 15729 lgsneg 15743 lgsdilem 15746 gausslemma2dlem1a 15777 gausslemma2dlem3 15782 supfz 16611 inffz 16612 |
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