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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 10708 | . 2 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (𝐴 ≤ 𝐵 ↔ ¬ 𝐵 < 𝐴)) | |
4 | 1, 2, 3 | syl2anc 586 | 1 ⊢ (𝜑 → (𝐴 ≤ 𝐵 ↔ ¬ 𝐵 < 𝐴)) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 208 ∈ wcel 2114 class class class wbr 5068 ℝ*cxr 10676 < clt 10677 ≤ cle 10678 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-sep 5205 ax-nul 5212 ax-pr 5332 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ral 3145 df-rex 3146 df-rab 3149 df-v 3498 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-nul 4294 df-if 4470 df-sn 4570 df-pr 4572 df-op 4576 df-br 5069 df-opab 5131 df-xp 5563 df-cnv 5565 df-le 10683 |
This theorem is referenced by: xrnltled 10711 supxrleub 12722 infxrgelb 12731 ixxub 12762 ixxlb 12763 icodisj 12865 supicclub2 12892 bldisj 23010 icombl 24167 ioorcl2 24175 ply1divmo 24731 ig1peu 24767 psercnlem1 25015 infxrge0gelb 30492 supxrgere 41608 supxrgelem 41612 lenelioc 41819 iccdificc 41822 limsupub 41992 fge0iccico 42659 sge0sn 42668 sge0rpcpnf 42710 pimltmnf2 42986 pimconstlt0 42989 pimgtpnf2 42992 pimdecfgtioo 43002 pimincfltioo 43003 |
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