Theorem xrlenltd 10424

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	⊢ (𝜑 → 𝐴 ∈ ℝ*)
xrlenltd.b	⊢ (𝜑 → 𝐵 ∈ ℝ*)

Assertion

Ref	Expression
xrlenltd	⊢ (𝜑 → (𝐴 ≤ 𝐵 ↔ ¬ 𝐵 < 𝐴))

Proof of Theorem xrlenltd

Step	Hyp	Ref	Expression
1		xrlenltd.a	. 2 ⊢ (𝜑 → 𝐴 ∈ ℝ*)
2		xrlenltd.b	. 2 ⊢ (𝜑 → 𝐵 ∈ ℝ*)
3		xrlenlt 10423	. 2 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (𝐴 ≤ 𝐵 ↔ ¬ 𝐵 < 𝐴))
4	1, 2, 3	syl2anc 581	1 ⊢ (𝜑 → (𝐴 ≤ 𝐵 ↔ ¬ 𝐵 < 𝐴))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 198   ∈ wcel 2166   class class class wbr 4874  ℝ^*cxr 10391   < clt 10392   ≤ cle 10393

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1896  ax-4 1910  ax-5 2011  ax-6 2077  ax-7 2114  ax-9 2175  ax-10 2194  ax-11 2209  ax-12 2222  ax-13 2391  ax-ext 2804  ax-sep 5006  ax-nul 5014  ax-pr 5128

This theorem depends on definitions:  df-bi 199  df-an 387  df-or 881  df-3an 1115  df-tru 1662  df-ex 1881  df-nf 1885  df-sb 2070  df-mo 2606  df-eu 2641  df-clab 2813  df-cleq 2819  df-clel 2822  df-nfc 2959  df-ral 3123  df-rex 3124  df-rab 3127  df-v 3417  df-dif 3802  df-un 3804  df-in 3806  df-ss 3813  df-nul 4146  df-if 4308  df-sn 4399  df-pr 4401  df-op 4405  df-br 4875  df-opab 4937  df-xp 5349  df-cnv 5351  df-le 10398

This theorem is referenced by:  infxrgelb  12454  ixxlb  12486  infxrge0gelb  30079  supxrgere  40347  supxrgelem  40351  lenelioc  40559  iccdificc  40562  limsupub  40732  fge0iccico  41379  sge0sn  41388  sge0rpcpnf  41430  pimltmnf2  41706  pimconstlt0  41709  pimgtpnf2  41712  pimdecfgtioo  41722  pimincfltioo  41723