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Theorem icogelb 13349
Description: An element of a left-closed right-open interval is greater than or equal to its lower bound. (Contributed by Glauco Siliprandi, 11-Dec-2019.)
Assertion
Ref Expression
icogelb ((𝐴 ∈ ℝ*𝐵 ∈ ℝ*𝐶 ∈ (𝐴[,)𝐵)) → 𝐴𝐶)

Proof of Theorem icogelb
StepHypRef Expression
1 elico1 13341 . . 3 ((𝐴 ∈ ℝ*𝐵 ∈ ℝ*) → (𝐶 ∈ (𝐴[,)𝐵) ↔ (𝐶 ∈ ℝ*𝐴𝐶𝐶 < 𝐵)))
2 simp2 1138 . . 3 ((𝐶 ∈ ℝ*𝐴𝐶𝐶 < 𝐵) → 𝐴𝐶)
31, 2biimtrdi 253 . 2 ((𝐴 ∈ ℝ*𝐵 ∈ ℝ*) → (𝐶 ∈ (𝐴[,)𝐵) → 𝐴𝐶))
433impia 1118 1 ((𝐴 ∈ ℝ*𝐵 ∈ ℝ*𝐶 ∈ (𝐴[,)𝐵)) → 𝐴𝐶)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395  w3a 1087  wcel 2114   class class class wbr 5085  (class class class)co 7367  *cxr 11178   < clt 11179  cle 11180  [,)cico 13300
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2708  ax-sep 5231  ax-pr 5375  ax-un 7689  ax-cnex 11094  ax-resscn 11095
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ral 3052  df-rex 3062  df-rab 3390  df-v 3431  df-sbc 3729  df-dif 3892  df-un 3894  df-in 3896  df-ss 3906  df-nul 4274  df-if 4467  df-pw 4543  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4851  df-br 5086  df-opab 5148  df-id 5526  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-iota 6454  df-fun 6500  df-fv 6506  df-ov 7370  df-oprab 7371  df-mpo 7372  df-xr 11183  df-ico 13304
This theorem is referenced by:  icogelbd  13350  fprodge0  15958  fprodge1  15960  hgt750lemf  34797  xralrple2  45784  icoopn  45955  fsumge0cl  46003  limcresioolb  46071  fourierdlem41  46576  fourierdlem43  46578  fourierdlem46  46580  fourierdlem48  46582  fouriersw  46659  sge0isum  46855  sge0ad2en  46859  sge0uzfsumgt  46872  sge0seq  46874  sge0reuz  46875  hoidmv1lelem2  47020  hoidmvlelem1  47023  hoidmvlelem2  47024  ovnhoilem1  47029  hspdifhsp  47044  hspmbllem2  47055  iinhoiicclem  47101
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