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Theorem trfilss 23029
Description: If 𝐴 is a member of the filter, then the filter truncated to 𝐴 is a subset of the original filter. (Contributed by Mario Carneiro, 15-Oct-2015.)
Assertion
Ref Expression
trfilss ((𝐹 ∈ (Fil‘𝑋) ∧ 𝐴𝐹) → (𝐹t 𝐴) ⊆ 𝐹)

Proof of Theorem trfilss
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 restval 17126 . 2 ((𝐹 ∈ (Fil‘𝑋) ∧ 𝐴𝐹) → (𝐹t 𝐴) = ran (𝑥𝐹 ↦ (𝑥𝐴)))
2 filin 22994 . . . . . 6 ((𝐹 ∈ (Fil‘𝑋) ∧ 𝑥𝐹𝐴𝐹) → (𝑥𝐴) ∈ 𝐹)
323expa 1117 . . . . 5 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑥𝐹) ∧ 𝐴𝐹) → (𝑥𝐴) ∈ 𝐹)
43an32s 649 . . . 4 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝐴𝐹) ∧ 𝑥𝐹) → (𝑥𝐴) ∈ 𝐹)
54fmpttd 6983 . . 3 ((𝐹 ∈ (Fil‘𝑋) ∧ 𝐴𝐹) → (𝑥𝐹 ↦ (𝑥𝐴)):𝐹𝐹)
65frnd 6602 . 2 ((𝐹 ∈ (Fil‘𝑋) ∧ 𝐴𝐹) → ran (𝑥𝐹 ↦ (𝑥𝐴)) ⊆ 𝐹)
71, 6eqsstrd 3960 1 ((𝐹 ∈ (Fil‘𝑋) ∧ 𝐴𝐹) → (𝐹t 𝐴) ⊆ 𝐹)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 396  wcel 2106  cin 3887  wss 3888  cmpt 5158  ran crn 5587  cfv 6428  (class class class)co 7269  t crest 17120  Filcfil 22985
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 5210  ax-sep 5223  ax-nul 5230  ax-pow 5288  ax-pr 5352  ax-un 7580
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-nel 3050  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-iun 4928  df-br 5076  df-opab 5138  df-mpt 5159  df-id 5486  df-xp 5592  df-rel 5593  df-cnv 5594  df-co 5595  df-dm 5596  df-rn 5597  df-res 5598  df-ima 5599  df-iota 6386  df-fun 6430  df-fn 6431  df-f 6432  df-f1 6433  df-fo 6434  df-f1o 6435  df-fv 6436  df-ov 7272  df-oprab 7273  df-mpo 7274  df-rest 17122  df-fbas 20583  df-fil 22986
This theorem is referenced by:  fgtr  23030  flimrest  23123
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