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Theorem perfi 22304
Description: Property of a perfect space. (Contributed by Mario Carneiro, 24-Dec-2016.)
Hypothesis
Ref Expression
lpfval.1 𝑋 = 𝐽
Assertion
Ref Expression
perfi ((𝐽 ∈ Perf ∧ 𝑃𝑋) → ¬ {𝑃} ∈ 𝐽)

Proof of Theorem perfi
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 lpfval.1 . . . 4 𝑋 = 𝐽
21isperf3 22302 . . 3 (𝐽 ∈ Perf ↔ (𝐽 ∈ Top ∧ ∀𝑥𝑋 ¬ {𝑥} ∈ 𝐽))
32simprbi 497 . 2 (𝐽 ∈ Perf → ∀𝑥𝑋 ¬ {𝑥} ∈ 𝐽)
4 sneq 4573 . . . . 5 (𝑥 = 𝑃 → {𝑥} = {𝑃})
54eleq1d 2823 . . . 4 (𝑥 = 𝑃 → ({𝑥} ∈ 𝐽 ↔ {𝑃} ∈ 𝐽))
65notbid 318 . . 3 (𝑥 = 𝑃 → (¬ {𝑥} ∈ 𝐽 ↔ ¬ {𝑃} ∈ 𝐽))
76rspccva 3560 . 2 ((∀𝑥𝑋 ¬ {𝑥} ∈ 𝐽𝑃𝑋) → ¬ {𝑃} ∈ 𝐽)
83, 7sylan 580 1 ((𝐽 ∈ Perf ∧ 𝑃𝑋) → ¬ {𝑃} ∈ 𝐽)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 396   = wceq 1539  wcel 2106  wral 3064  {csn 4563   cuni 4841  Topctop 22040  Perfcperf 22284
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2709  ax-rep 5211  ax-sep 5225  ax-nul 5232  ax-pow 5290  ax-pr 5354  ax-un 7588
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-nf 1787  df-sb 2068  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2816  df-nfc 2889  df-ne 2944  df-ral 3069  df-rex 3070  df-reu 3072  df-rab 3073  df-v 3433  df-sbc 3718  df-csb 3834  df-dif 3891  df-un 3893  df-in 3895  df-ss 3905  df-nul 4259  df-if 4462  df-pw 4537  df-sn 4564  df-pr 4566  df-op 4570  df-uni 4842  df-int 4882  df-iun 4928  df-iin 4929  df-br 5077  df-opab 5139  df-mpt 5160  df-id 5491  df-xp 5597  df-rel 5598  df-cnv 5599  df-co 5600  df-dm 5601  df-rn 5602  df-res 5603  df-ima 5604  df-iota 6393  df-fun 6437  df-fn 6438  df-f 6439  df-f1 6440  df-fo 6441  df-f1o 6442  df-fv 6443  df-top 22041  df-cld 22168  df-ntr 22169  df-cls 22170  df-lp 22285  df-perf 22286
This theorem is referenced by:  perfopn  22334
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