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Theorem lbioc 40252
 Description: An left open right closed interval doesn't contain its left endpoint. (Contributed by Glauco Siliprandi, 11-Dec-2019.)
Assertion
Ref Expression
lbioc ¬ 𝐴 ∈ (𝐴(,]𝐵)

Proof of Theorem lbioc
Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-ioc 12384 . . . . 5 (,] = (𝑥 ∈ ℝ*, 𝑦 ∈ ℝ* ↦ {𝑧 ∈ ℝ* ∣ (𝑥 < 𝑧𝑧𝑦)})
21elixx3g 12392 . . . 4 (𝐴 ∈ (𝐴(,]𝐵) ↔ ((𝐴 ∈ ℝ*𝐵 ∈ ℝ*𝐴 ∈ ℝ*) ∧ (𝐴 < 𝐴𝐴𝐵)))
32biimpi 206 . . 3 (𝐴 ∈ (𝐴(,]𝐵) → ((𝐴 ∈ ℝ*𝐵 ∈ ℝ*𝐴 ∈ ℝ*) ∧ (𝐴 < 𝐴𝐴𝐵)))
43simprld 747 . 2 (𝐴 ∈ (𝐴(,]𝐵) → 𝐴 < 𝐴)
51elmpt2cl1 7023 . . 3 (𝐴 ∈ (𝐴(,]𝐵) → 𝐴 ∈ ℝ*)
6 xrltnr 12157 . . 3 (𝐴 ∈ ℝ* → ¬ 𝐴 < 𝐴)
75, 6syl 17 . 2 (𝐴 ∈ (𝐴(,]𝐵) → ¬ 𝐴 < 𝐴)
84, 7pm2.65i 185 1 ¬ 𝐴 ∈ (𝐴(,]𝐵)
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   ∧ wa 382   ∧ w3a 1070   ∈ wcel 2144  {crab 3064   class class class wbr 4784  (class class class)co 6792  ℝ*cxr 10274   < clt 10275   ≤ cle 10276  (,]cioc 12380 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1869  ax-4 1884  ax-5 1990  ax-6 2056  ax-7 2092  ax-8 2146  ax-9 2153  ax-10 2173  ax-11 2189  ax-12 2202  ax-13 2407  ax-ext 2750  ax-sep 4912  ax-nul 4920  ax-pow 4971  ax-pr 5034  ax-un 7095  ax-cnex 10193  ax-resscn 10194  ax-pre-lttri 10211  ax-pre-lttrn 10212 This theorem depends on definitions:  df-bi 197  df-an 383  df-or 827  df-3or 1071  df-3an 1072  df-tru 1633  df-ex 1852  df-nf 1857  df-sb 2049  df-eu 2621  df-mo 2622  df-clab 2757  df-cleq 2763  df-clel 2766  df-nfc 2901  df-ne 2943  df-nel 3046  df-ral 3065  df-rex 3066  df-rab 3069  df-v 3351  df-sbc 3586  df-csb 3681  df-dif 3724  df-un 3726  df-in 3728  df-ss 3735  df-nul 4062  df-if 4224  df-pw 4297  df-sn 4315  df-pr 4317  df-op 4321  df-uni 4573  df-iun 4654  df-br 4785  df-opab 4845  df-mpt 4862  df-id 5157  df-po 5170  df-so 5171  df-xp 5255  df-rel 5256  df-cnv 5257  df-co 5258  df-dm 5259  df-rn 5260  df-res 5261  df-ima 5262  df-iota 5994  df-fun 6033  df-fn 6034  df-f 6035  df-f1 6036  df-fo 6037  df-f1o 6038  df-fv 6039  df-ov 6795  df-oprab 6796  df-mpt2 6797  df-1st 7314  df-2nd 7315  df-er 7895  df-en 8109  df-dom 8110  df-sdom 8111  df-pnf 10277  df-mnf 10278  df-xr 10279  df-ltxr 10280  df-ioc 12384 This theorem is referenced by:  fouriersw  40959
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