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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 11367 | . 2 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (𝐴 ≤ 𝐵 ↔ ¬ 𝐵 < 𝐴)) | |
| 4 | 1, 2, 3 | syl2anc 596 | 1 ⊢ (𝜑 → (𝐴 ≤ 𝐵 ↔ ¬ 𝐵 < 𝐴)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ↔ wb 209 ∈ wcel 2145 class class class wbr 5103 ℝ*cxr 11335 < clt 11336 ≤ cle 11337 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2733 ax-sep 5249 ax-pr 5391 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-clab 2740 df-cleq 2753 df-clel 2836 df-ral 3078 df-rex 3088 df-rab 3414 df-v 3453 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-sn 4585 df-pr 4587 df-op 4591 df-br 5104 df-opab 5168 df-xp 5657 df-cnv 5659 df-le 11342 |
| This theorem is used by: xrnltled 11371 supxrleub 13449 infxrgelb 13459 ixxub 13490 ixxlb 13491 icodisj 13600 supicclub2 13628 bldisj 24710 icombl 25878 ioorcl2 25886 ply1divmo 26447 ig1peu 26486 psercnlem1 26745 infxrge0gelb 33351 supxrgere 46314 supxrgelem 46318 lenelioc 46517 iccdificc 46520 limsupub 46683 fge0iccico 47349 sge0sn 47358 sge0rpcpnf 47400 pimltmnf2f 47676 pimconstlt0 47680 pimgtpnf2f 47684 pimdecfgtioo 47696 pimincfltioo 47697 |
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