Theorem iccgelbd 40088

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 12268	. 2 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ* ∧ 𝐶 ∈ (𝐴[,]𝐵)) → 𝐴 ≤ 𝐶)
5	1, 2, 3, 4	syl3anc 1366	1 ⊢ (𝜑 → 𝐴 ≤ 𝐶)

Syntax hints:   → wi 4   ∈ wcel 2030   class class class wbr 4685  (class class class)co 6690  ℝ^*cxr 10111   ≤ cle 10113  [,]cicc 12216

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-sep 4814  ax-nul 4822  ax-pr 4936  ax-un 6991  ax-cnex 10030  ax-resscn 10031

This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ral 2946  df-rex 2947  df-rab 2950  df-v 3233  df-sbc 3469  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-nul 3949  df-if 4120  df-sn 4211  df-pr 4213  df-op 4217  df-uni 4469  df-br 4686  df-opab 4746  df-id 5053  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-iota 5889  df-fun 5928  df-fv 5934  df-ov 6693  df-oprab 6694  df-mpt2 6695  df-xr 10116  df-icc 12220

This theorem is referenced by:  sqrlearg  40098