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Theorem iccgelbd 46758
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
StepHypRef 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 13557 . 2 ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ* ∧ 𝐶 ∈ (𝐴[,]𝐵)) → 𝐴 ≤ 𝐶)
51, 2, 3, 4syl3anc 1399 1 (𝜑 → 𝐴 ≤ 𝐶)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∈ wcel 2147   class class class wbr 5106  (class class class)co 7440  ℝ*cxr 11366   ≤ cle 11368  [,]cicc 13503
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735  ax-sep 5252  ax-pr 5395  ax-un 7772  ax-cnex 11280  ax-resscn 11281
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2102  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-sbc 3743  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-br 5107  df-opab 5171  df-id 5550  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-iota 6509  df-fun 6557  df-fv 6563  df-ov 7443  df-oprab 7444  df-mpo 7445  df-xr 11371  df-icc 13507
This theorem is used by:  sqrlearg  46768
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