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Theorem squeeze0 8923
Description: If a nonnegative number is less than any positive number, it is zero. (Contributed by NM, 11-Feb-2006.)
Assertion
Ref Expression
squeeze0 ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴 ∧ ∀𝑥 ∈ ℝ (0 < 𝑥𝐴 < 𝑥)) → 𝐴 = 0)
Distinct variable group:   𝑥,𝐴

Proof of Theorem squeeze0
StepHypRef Expression
1 ltnr 8096 . . . . 5 (𝐴 ∈ ℝ → ¬ 𝐴 < 𝐴)
213ad2ant1 1020 . . . 4 ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴 ∧ ∀𝑥 ∈ ℝ (0 < 𝑥𝐴 < 𝑥)) → ¬ 𝐴 < 𝐴)
3 breq2 4033 . . . . . . 7 (𝑥 = 𝐴 → (0 < 𝑥 ↔ 0 < 𝐴))
4 breq2 4033 . . . . . . 7 (𝑥 = 𝐴 → (𝐴 < 𝑥𝐴 < 𝐴))
53, 4imbi12d 234 . . . . . 6 (𝑥 = 𝐴 → ((0 < 𝑥𝐴 < 𝑥) ↔ (0 < 𝐴𝐴 < 𝐴)))
65rspcva 2862 . . . . 5 ((𝐴 ∈ ℝ ∧ ∀𝑥 ∈ ℝ (0 < 𝑥𝐴 < 𝑥)) → (0 < 𝐴𝐴 < 𝐴))
763adant2 1018 . . . 4 ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴 ∧ ∀𝑥 ∈ ℝ (0 < 𝑥𝐴 < 𝑥)) → (0 < 𝐴𝐴 < 𝐴))
82, 7mtod 664 . . 3 ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴 ∧ ∀𝑥 ∈ ℝ (0 < 𝑥𝐴 < 𝑥)) → ¬ 0 < 𝐴)
9 simp1 999 . . . 4 ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴 ∧ ∀𝑥 ∈ ℝ (0 < 𝑥𝐴 < 𝑥)) → 𝐴 ∈ ℝ)
10 0red 8020 . . . 4 ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴 ∧ ∀𝑥 ∈ ℝ (0 < 𝑥𝐴 < 𝑥)) → 0 ∈ ℝ)
119, 10lenltd 8137 . . 3 ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴 ∧ ∀𝑥 ∈ ℝ (0 < 𝑥𝐴 < 𝑥)) → (𝐴 ≤ 0 ↔ ¬ 0 < 𝐴))
128, 11mpbird 167 . 2 ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴 ∧ ∀𝑥 ∈ ℝ (0 < 𝑥𝐴 < 𝑥)) → 𝐴 ≤ 0)
13 simp2 1000 . 2 ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴 ∧ ∀𝑥 ∈ ℝ (0 < 𝑥𝐴 < 𝑥)) → 0 ≤ 𝐴)
149, 10letri3d 8135 . 2 ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴 ∧ ∀𝑥 ∈ ℝ (0 < 𝑥𝐴 < 𝑥)) → (𝐴 = 0 ↔ (𝐴 ≤ 0 ∧ 0 ≤ 𝐴)))
1512, 13, 14mpbir2and 946 1 ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴 ∧ ∀𝑥 ∈ ℝ (0 < 𝑥𝐴 < 𝑥)) → 𝐴 = 0)
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wi 4  w3a 980   = wceq 1364  wcel 2164  wral 2472   class class class wbr 4029  cr 7871  0cc0 7872   < clt 8054  cle 8055
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 615  ax-in2 616  ax-io 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-13 2166  ax-14 2167  ax-ext 2175  ax-sep 4147  ax-pow 4203  ax-pr 4238  ax-un 4464  ax-setind 4569  ax-cnex 7963  ax-resscn 7964  ax-1re 7966  ax-addrcl 7969  ax-rnegex 7981  ax-pre-ltirr 7984  ax-pre-apti 7987
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-fal 1370  df-nf 1472  df-sb 1774  df-eu 2045  df-mo 2046  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-ne 2365  df-nel 2460  df-ral 2477  df-rex 2478  df-rab 2481  df-v 2762  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-pw 3603  df-sn 3624  df-pr 3625  df-op 3627  df-uni 3836  df-br 4030  df-opab 4091  df-xp 4665  df-cnv 4667  df-pnf 8056  df-mnf 8057  df-xr 8058  df-ltxr 8059  df-le 8060
This theorem is referenced by: (None)
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