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Theorem mrieqvd 16070
Description: In a Moore system, a set is independent if and only if, for all elements of the set, the closure of the set with the element removed is unequal to the closure of the original set. Part of Proposition 4.1.3 in [FaureFrolicher] p. 83. (Contributed by David Moews, 1-May-2017.)
Hypotheses
Ref Expression
mrieqvd.1 (𝜑𝐴 ∈ (Moore‘𝑋))
mrieqvd.2 𝑁 = (mrCls‘𝐴)
mrieqvd.3 𝐼 = (mrInd‘𝐴)
mrieqvd.4 (𝜑𝑆𝑋)
Assertion
Ref Expression
mrieqvd (𝜑 → (𝑆𝐼 ↔ ∀𝑥𝑆 (𝑁‘(𝑆 ∖ {𝑥})) ≠ (𝑁𝑆)))
Distinct variable groups:   𝑥,𝐴   𝑥,𝑆   𝜑,𝑥
Allowed substitution hints:   𝐼(𝑥)   𝑁(𝑥)   𝑋(𝑥)

Proof of Theorem mrieqvd
StepHypRef Expression
1 mrieqvd.2 . . 3 𝑁 = (mrCls‘𝐴)
2 mrieqvd.3 . . 3 𝐼 = (mrInd‘𝐴)
3 mrieqvd.1 . . 3 (𝜑𝐴 ∈ (Moore‘𝑋))
4 mrieqvd.4 . . 3 (𝜑𝑆𝑋)
51, 2, 3, 4ismri2d 16065 . 2 (𝜑 → (𝑆𝐼 ↔ ∀𝑥𝑆 ¬ 𝑥 ∈ (𝑁‘(𝑆 ∖ {𝑥}))))
63adantr 479 . . . . 5 ((𝜑𝑥𝑆) → 𝐴 ∈ (Moore‘𝑋))
74adantr 479 . . . . 5 ((𝜑𝑥𝑆) → 𝑆𝑋)
8 simpr 475 . . . . 5 ((𝜑𝑥𝑆) → 𝑥𝑆)
96, 1, 7, 8mrieqvlemd 16061 . . . 4 ((𝜑𝑥𝑆) → (𝑥 ∈ (𝑁‘(𝑆 ∖ {𝑥})) ↔ (𝑁‘(𝑆 ∖ {𝑥})) = (𝑁𝑆)))
109necon3bbid 2818 . . 3 ((𝜑𝑥𝑆) → (¬ 𝑥 ∈ (𝑁‘(𝑆 ∖ {𝑥})) ↔ (𝑁‘(𝑆 ∖ {𝑥})) ≠ (𝑁𝑆)))
1110ralbidva 2967 . 2 (𝜑 → (∀𝑥𝑆 ¬ 𝑥 ∈ (𝑁‘(𝑆 ∖ {𝑥})) ↔ ∀𝑥𝑆 (𝑁‘(𝑆 ∖ {𝑥})) ≠ (𝑁𝑆)))
125, 11bitrd 266 1 (𝜑 → (𝑆𝐼 ↔ ∀𝑥𝑆 (𝑁‘(𝑆 ∖ {𝑥})) ≠ (𝑁𝑆)))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 194  wa 382   = wceq 1474  wcel 1976  wne 2779  wral 2895  cdif 3536  wss 3539  {csn 4124  cfv 5790  Moorecmre 16014  mrClscmrc 16015  mrIndcmri 16016
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1712  ax-4 1727  ax-5 1826  ax-6 1874  ax-7 1921  ax-8 1978  ax-9 1985  ax-10 2005  ax-11 2020  ax-12 2033  ax-13 2233  ax-ext 2589  ax-sep 4703  ax-nul 4712  ax-pow 4764  ax-pr 4828  ax-un 6825
This theorem depends on definitions:  df-bi 195  df-or 383  df-an 384  df-3an 1032  df-tru 1477  df-ex 1695  df-nf 1700  df-sb 1867  df-eu 2461  df-mo 2462  df-clab 2596  df-cleq 2602  df-clel 2605  df-nfc 2739  df-ne 2781  df-ral 2900  df-rex 2901  df-rab 2904  df-v 3174  df-sbc 3402  df-csb 3499  df-dif 3542  df-un 3544  df-in 3546  df-ss 3553  df-nul 3874  df-if 4036  df-pw 4109  df-sn 4125  df-pr 4127  df-op 4131  df-uni 4367  df-int 4405  df-br 4578  df-opab 4638  df-mpt 4639  df-id 4943  df-xp 5034  df-rel 5035  df-cnv 5036  df-co 5037  df-dm 5038  df-rn 5039  df-res 5040  df-ima 5041  df-iota 5754  df-fun 5792  df-fn 5793  df-f 5794  df-fv 5798  df-mre 16018  df-mrc 16019  df-mri 16020
This theorem is referenced by: (None)
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