Theorem iccgelbd 42546

Description: An element of a closed interval is more than or equal to its lower bound. (Contributed by Glauco Siliprandi, 26-Jun-2021.)

Hypotheses

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

Assertion

Ref	Expression
iccgelbd	⊢ (𝜑 → 𝐴 ≤ 𝐶)

Proof of Theorem iccgelbd

Step	Hyp	Ref	Expression
1		iccgelbd.1	. 2 ⊢ (𝜑 → 𝐴 ∈ ℝ*)
2		iccgelbd.2	. 2 ⊢ (𝜑 → 𝐵 ∈ ℝ*)
3		iccgelbd.3	. 2 ⊢ (𝜑 → 𝐶 ∈ (𝐴[,]𝐵))
4		iccgelb 12835	. 2 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ* ∧ 𝐶 ∈ (𝐴[,]𝐵)) → 𝐴 ≤ 𝐶)
5	1, 2, 3, 4	syl3anc 1368	1 ⊢ (𝜑 → 𝐴 ≤ 𝐶)

Syntax hints:   → wi 4   ∈ wcel 2111   class class class wbr 5032  (class class class)co 7150  ℝ^*cxr 10712   ≤ cle 10714  [,]cicc 12782

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 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2729  ax-sep 5169  ax-nul 5176  ax-pr 5298  ax-un 7459  ax-cnex 10631  ax-resscn 10632

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-fal 1551  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2557  df-eu 2588  df-clab 2736  df-cleq 2750  df-clel 2830  df-nfc 2901  df-ral 3075  df-rex 3076  df-rab 3079  df-v 3411  df-sbc 3697  df-dif 3861  df-un 3863  df-in 3865  df-ss 3875  df-nul 4226  df-if 4421  df-sn 4523  df-pr 4525  df-op 4529  df-uni 4799  df-br 5033  df-opab 5095  df-id 5430  df-xp 5530  df-rel 5531  df-cnv 5532  df-co 5533  df-dm 5534  df-iota 6294  df-fun 6337  df-fv 6343  df-ov 7153  df-oprab 7154  df-mpo 7155  df-xr 10717  df-icc 12786

This theorem is referenced by:  sqrlearg  42556