Theorem icoltubd 41906

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 41869	. 2 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ* ∧ 𝐶 ∈ (𝐴[,)𝐵)) → 𝐶 < 𝐵)
5	1, 2, 3, 4	syl3anc 1367	1 ⊢ (𝜑 → 𝐶 < 𝐵)

Syntax hints:   → wi 4   ∈ wcel 2114   class class class wbr 5047  (class class class)co 7137  ℝ^*cxr 10655   < clt 10656  [,)cico 12722

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 2792  ax-sep 5184  ax-nul 5191  ax-pr 5311  ax-un 7442  ax-cnex 10574  ax-resscn 10575

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 2653  df-clab 2799  df-cleq 2813  df-clel 2891  df-nfc 2959  df-ral 3138  df-rex 3139  df-rab 3142  df-v 3483  df-sbc 3759  df-dif 3922  df-un 3924  df-in 3926  df-ss 3935  df-nul 4275  df-if 4449  df-sn 4549  df-pr 4551  df-op 4555  df-uni 4820  df-br 5048  df-opab 5110  df-id 5441  df-xp 5542  df-rel 5543  df-cnv 5544  df-co 5545  df-dm 5546  df-iota 6295  df-fun 6338  df-fv 6344  df-ov 7140  df-oprab 7141  df-mpo 7142  df-xr 10660  df-ico 12726

This theorem is referenced by:  icomnfinre  41913  xlimmnfvlem1  42198