Theorem iccgelbd 40660

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 12542	. 2 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ* ∧ 𝐶 ∈ (𝐴[,]𝐵)) → 𝐴 ≤ 𝐶)
5	1, 2, 3, 4	syl3anc 1439	1 ⊢ (𝜑 → 𝐴 ≤ 𝐶)

Syntax hints:   → wi 4   ∈ wcel 2106   class class class wbr 4886  (class class class)co 6922  ℝ^*cxr 10410   ≤ cle 10412  [,]cicc 12490

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1839  ax-4 1853  ax-5 1953  ax-6 2021  ax-7 2054  ax-8 2108  ax-9 2115  ax-10 2134  ax-11 2149  ax-12 2162  ax-13 2333  ax-ext 2753  ax-sep 5017  ax-nul 5025  ax-pr 5138  ax-un 7226  ax-cnex 10328  ax-resscn 10329

This theorem depends on definitions:  df-bi 199  df-an 387  df-or 837  df-3an 1073  df-tru 1605  df-ex 1824  df-nf 1828  df-sb 2012  df-mo 2550  df-eu 2586  df-clab 2763  df-cleq 2769  df-clel 2773  df-nfc 2920  df-ral 3094  df-rex 3095  df-rab 3098  df-v 3399  df-sbc 3652  df-dif 3794  df-un 3796  df-in 3798  df-ss 3805  df-nul 4141  df-if 4307  df-sn 4398  df-pr 4400  df-op 4404  df-uni 4672  df-br 4887  df-opab 4949  df-id 5261  df-xp 5361  df-rel 5362  df-cnv 5363  df-co 5364  df-dm 5365  df-iota 6099  df-fun 6137  df-fv 6143  df-ov 6925  df-oprab 6926  df-mpt2 6927  df-xr 10415  df-icc 12494

This theorem is referenced by:  sqrlearg  40670