Theorem iccgelbd 43116

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 13163	. 2 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ* ∧ 𝐶 ∈ (𝐴[,]𝐵)) → 𝐴 ≤ 𝐶)
5	1, 2, 3, 4	syl3anc 1369	1 ⊢ (𝜑 → 𝐴 ≤ 𝐶)

Syntax hints:   → wi 4   ∈ wcel 2101   class class class wbr 5077  (class class class)co 7295  ℝ^*cxr 11036   ≤ cle 11038  [,]cicc 13110

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2103  ax-9 2111  ax-10 2132  ax-11 2149  ax-12 2166  ax-ext 2704  ax-sep 5226  ax-nul 5233  ax-pr 5355  ax-un 7608  ax-cnex 10955  ax-resscn 10956

This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3an 1087  df-tru 1540  df-fal 1550  df-ex 1778  df-nf 1782  df-sb 2063  df-mo 2535  df-eu 2564  df-clab 2711  df-cleq 2725  df-clel 2811  df-nfc 2884  df-ral 3060  df-rex 3069  df-rab 3224  df-v 3436  df-sbc 3719  df-dif 3892  df-un 3894  df-in 3896  df-ss 3906  df-nul 4260  df-if 4463  df-sn 4565  df-pr 4567  df-op 4571  df-uni 4842  df-br 5078  df-opab 5140  df-id 5491  df-xp 5597  df-rel 5598  df-cnv 5599  df-co 5600  df-dm 5601  df-iota 6399  df-fun 6449  df-fv 6455  df-ov 7298  df-oprab 7299  df-mpo 7300  df-xr 11041  df-icc 13114

This theorem is referenced by:  sqrlearg  43126