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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 11413 | . 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 2147 class class class wbr 5108 ℝ*cxr 11381 < clt 11382 ≤ cle 11383 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-ext 2735 ax-sep 5255 ax-pr 5398 |
| 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 2102 df-clab 2742 df-cleq 2755 df-clel 2839 df-ral 3081 df-rex 3091 df-rab 3417 df-v 3456 df-ss 3901 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-sn 4589 df-pr 4591 df-op 4841 df-br 5109 df-opab 5174 df-xp 5664 df-cnv 5666 df-le 11388 |
| This theorem is used by: xrnltled 11417 supxrleub 13496 infxrgelb 13506 ixxub 13537 ixxlb 13538 icodisj 13647 supicclub2 13675 bldisj 24772 icombl 25940 ioorcl2 25948 ply1divmo 26509 ig1peu 26548 psercnlem1 26809 infxrge0gelb 33454 supxrgere 46618 supxrgelem 46622 lenelioc 46821 iccdificc 46824 limsupub 46987 fge0iccico 47653 sge0sn 47662 sge0rpcpnf 47704 pimltmnf2f 47980 pimconstlt0 47984 pimgtpnf2f 47988 pimdecfgtioo 48000 pimincfltioo 48001 |
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