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Theorem mrcsncl 17537
Description: The Moore closure of a singleton is a closed set. (Contributed by Stefan O'Rear, 31-Jan-2015.)
Hypothesis
Ref Expression
mrcfval.f 𝐹 = (mrCls‘𝐶)
Assertion
Ref Expression
mrcsncl ((𝐶 ∈ (Moore‘𝑋) ∧ 𝑈𝑋) → (𝐹‘{𝑈}) ∈ 𝐶)

Proof of Theorem mrcsncl
StepHypRef Expression
1 snssi 4762 . 2 (𝑈𝑋 → {𝑈} ⊆ 𝑋)
2 mrcfval.f . . 3 𝐹 = (mrCls‘𝐶)
32mrccl 17536 . 2 ((𝐶 ∈ (Moore‘𝑋) ∧ {𝑈} ⊆ 𝑋) → (𝐹‘{𝑈}) ∈ 𝐶)
41, 3sylan2 593 1 ((𝐶 ∈ (Moore‘𝑋) ∧ 𝑈𝑋) → (𝐹‘{𝑈}) ∈ 𝐶)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395   = wceq 1540  wcel 2109  wss 3905  {csn 4579  cfv 6486  Moorecmre 17503  mrClscmrc 17504
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-sep 5238  ax-nul 5248  ax-pow 5307  ax-pr 5374  ax-un 7675
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-ral 3045  df-rex 3054  df-rab 3397  df-v 3440  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-nul 4287  df-if 4479  df-pw 4555  df-sn 4580  df-pr 4582  df-op 4586  df-uni 4862  df-int 4900  df-br 5096  df-opab 5158  df-mpt 5177  df-id 5518  df-xp 5629  df-rel 5630  df-cnv 5631  df-co 5632  df-dm 5633  df-rn 5634  df-res 5635  df-ima 5636  df-iota 6442  df-fun 6488  df-fn 6489  df-f 6490  df-fv 6494  df-mre 17507  df-mrc 17508
This theorem is referenced by:  pgpfac1lem1  19974  pgpfac1lem2  19975  pgpfac1lem3a  19976  pgpfac1lem3  19977  pgpfac1lem4  19978  pgpfac1lem5  19979  pgpfaclem1  19981  pgpfaclem2  19982
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