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| Mirrors > Home > MPE Home > Th. List > xrlenltd | Structured version Visualization version GIF version | ||
| Description: "Less than or equal to" expressed in terms of "less than", for extended reals. (Contributed by Glauco Siliprandi, 17-Aug-2020.) |
| Ref | Expression |
|---|---|
| xrlenltd.a | ⊢ (𝜑 → 𝐴 ∈ ℝ*) |
| xrlenltd.b | ⊢ (𝜑 → 𝐵 ∈ ℝ*) |
| Ref | Expression |
|---|---|
| xrlenltd | ⊢ (𝜑 → (𝐴 ≤ 𝐵 ↔ ¬ 𝐵 < 𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | xrlenltd.a | . 2 ⊢ (𝜑 → 𝐴 ∈ ℝ*) | |
| 2 | xrlenltd.b | . 2 ⊢ (𝜑 → 𝐵 ∈ ℝ*) | |
| 3 | xrlenlt 11275 | . 2 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (𝐴 ≤ 𝐵 ↔ ¬ 𝐵 < 𝐴)) | |
| 4 | 1, 2, 3 | syl2anc 595 | 1 ⊢ (𝜑 → (𝐴 ≤ 𝐵 ↔ ¬ 𝐵 < 𝐴)) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ↔ wb 209 ∈ wcel 2143 class class class wbr 5110 ℝ*cxr 11243 < clt 11244 ≤ cle 11245 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-ext 2735 ax-sep 5258 ax-pr 5406 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-sb 2097 df-clab 2742 df-cleq 2755 df-clel 2838 df-ral 3080 df-rex 3090 df-rab 3417 df-v 3457 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4288 df-if 4489 df-sn 4591 df-pr 4593 df-op 4597 df-br 5111 df-opab 5175 df-xp 5669 df-cnv 5671 df-le 11250 |
| This theorem is referenced by: xrnltled 11279 supxrleub 13353 infxrgelb 13363 ixxub 13394 ixxlb 13395 icodisj 13504 supicclub2 13532 bldisj 24536 icombl 25704 ioorcl2 25712 ply1divmo 26274 ig1peu 26313 psercnlem1 26569 infxrge0gelb 33092 supxrgere 46032 supxrgelem 46036 lenelioc 46235 iccdificc 46238 limsupub 46401 fge0iccico 47067 sge0sn 47076 sge0rpcpnf 47118 pimltmnf2f 47394 pimconstlt0 47398 pimgtpnf2f 47402 pimdecfgtioo 47414 pimincfltioo 47415 |
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