Theorem icoltubd 40567

Description: An element of a left-closed right-open interval is less than its upper bound. (Contributed by Glauco Siliprandi, 26-Jun-2021.)

Hypotheses

Ref	Expression
icoltubd.1	⊢ (𝜑 → 𝐴 ∈ ℝ*)
icoltubd.2	⊢ (𝜑 → 𝐵 ∈ ℝ*)
icoltubd.3	⊢ (𝜑 → 𝐶 ∈ (𝐴[,)𝐵))

Assertion

Ref	Expression
icoltubd	⊢ (𝜑 → 𝐶 < 𝐵)

Proof of Theorem icoltubd

Step	Hyp	Ref	Expression
1		icoltubd.1	. 2 ⊢ (𝜑 → 𝐴 ∈ ℝ*)
2		icoltubd.2	. 2 ⊢ (𝜑 → 𝐵 ∈ ℝ*)
3		icoltubd.3	. 2 ⊢ (𝜑 → 𝐶 ∈ (𝐴[,)𝐵))
4		icoltub 40530	. 2 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ* ∧ 𝐶 ∈ (𝐴[,)𝐵)) → 𝐶 < 𝐵)
5	1, 2, 3, 4	syl3anc 1496	1 ⊢ (𝜑 → 𝐶 < 𝐵)

Syntax hints:   → wi 4   ∈ wcel 2166   class class class wbr 4873  (class class class)co 6905  ℝ^*cxr 10390   < clt 10391  [,)cico 12465

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-8 2168  ax-9 2175  ax-10 2194  ax-11 2209  ax-12 2222  ax-13 2391  ax-ext 2803  ax-sep 5005  ax-nul 5013  ax-pr 5127  ax-un 7209  ax-cnex 10308  ax-resscn 10309

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 2605  df-eu 2640  df-clab 2812  df-cleq 2818  df-clel 2821  df-nfc 2958  df-ral 3122  df-rex 3123  df-rab 3126  df-v 3416  df-sbc 3663  df-dif 3801  df-un 3803  df-in 3805  df-ss 3812  df-nul 4145  df-if 4307  df-sn 4398  df-pr 4400  df-op 4404  df-uni 4659  df-br 4874  df-opab 4936  df-id 5250  df-xp 5348  df-rel 5349  df-cnv 5350  df-co 5351  df-dm 5352  df-iota 6086  df-fun 6125  df-fv 6131  df-ov 6908  df-oprab 6909  df-mpt2 6910  df-xr 10395  df-ico 12469

This theorem is referenced by:  icomnfinre  40574  xlimmnfvlem1  40853