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Theorem xrlenltd 11271
Description: "Less than or equal to" expressed in terms of "less than", for extended reals. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
Hypotheses
Ref Expression
xrlenltd.a (𝜑𝐴 ∈ ℝ*)
xrlenltd.b (𝜑𝐵 ∈ ℝ*)
Assertion
Ref Expression
xrlenltd (𝜑 → (𝐴𝐵 ↔ ¬ 𝐵 < 𝐴))

Proof of Theorem xrlenltd
StepHypRef Expression
1 xrlenltd.a . 2 (𝜑𝐴 ∈ ℝ*)
2 xrlenltd.b . 2 (𝜑𝐵 ∈ ℝ*)
3 xrlenlt 11270 . 2 ((𝐴 ∈ ℝ*𝐵 ∈ ℝ*) → (𝐴𝐵 ↔ ¬ 𝐵 < 𝐴))
41, 2, 3syl2anc 595 1 (𝜑 → (𝐴𝐵 ↔ ¬ 𝐵 < 𝐴))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 209  wcel 2149   class class class wbr 5110  *cxr 11238   < clt 11239  cle 11240
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-ext 2741  ax-sep 5258  ax-pr 5402
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-sb 2098  df-clab 2748  df-cleq 2761  df-clel 2844  df-ral 3086  df-rex 3096  df-rab 3424  df-v 3465  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-nul 4295  df-if 4490  df-sn 4592  df-pr 4594  df-op 4598  df-br 5111  df-opab 5175  df-xp 5665  df-cnv 5667  df-le 11245
This theorem is referenced by:  xrnltled  11274  supxrleub  13348  infxrgelb  13358  ixxub  13389  ixxlb  13390  icodisj  13499  supicclub2  13527  bldisj  24520  icombl  25688  ioorcl2  25696  ply1divmo  26258  ig1peu  26297  psercnlem1  26550  infxrge0gelb  33048  supxrgere  45934  supxrgelem  45938  lenelioc  46137  iccdificc  46140  limsupub  46303  fge0iccico  46969  sge0sn  46978  sge0rpcpnf  47020  pimltmnf2f  47296  pimconstlt0  47300  pimgtpnf2f  47304  pimdecfgtioo  47316  pimincfltioo  47317
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