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Theorem mptrcl 6995
Description: Reverse closure for a mapping: If the function value of a mapping has a member, the argument belongs to the base class of the mapping. (Contributed by AV, 4-Apr-2020.)
Hypothesis
Ref Expression
mptrcl.1 𝐹 = (𝑥 ∈ 𝐴 ↦ 𝐵)
Assertion
Ref Expression
mptrcl (𝐼 ∈ (𝐹‘𝑋) → 𝑋 ∈ 𝐴)
Distinct variable group:   𝑥,𝐴
Allowed substitution hints:   𝐵(𝑥)   𝐹(𝑥)   𝐼(𝑥)   𝑋(𝑥)

Proof of Theorem mptrcl
StepHypRef Expression
1 n0i 4286 . 2 (𝐼 ∈ (𝐹‘𝑋) → ¬ (𝐹‘𝑋) = ∅)
2 mptrcl.1 . . . . 5 𝐹 = (𝑥 ∈ 𝐴 ↦ 𝐵)
32dmmptss 6235 . . . 4 dom 𝐹 ⊆ 𝐴
43sseli 3927 . . 3 (𝑋 ∈ dom 𝐹 → 𝑋 ∈ 𝐴)
5 ndmfv 6909 . . 3 (¬ 𝑋 ∈ dom 𝐹 → (𝐹‘𝑋) = ∅)
64, 5nsyl4 159 . 2 (¬ (𝐹‘𝑋) = ∅ → 𝑋 ∈ 𝐴)
71, 6syl 18 1 (𝐼 ∈ (𝐹‘𝑋) → 𝑋 ∈ 𝐴)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  ¬ wn 3   → wi 4   = wceq 1570   ∈ wcel 2145  ∅c0 4279   ↦ cmpt 5186  dom cdm 5651  ‘cfv 6531
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2733  ax-sep 5249  ax-nul 5260  ax-pr 5391
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-opab 5168  df-mpt 5187  df-xp 5657  df-rel 5658  df-cnv 5659  df-dm 5661  df-rn 5662  df-res 5663  df-ima 5664  df-iota 6487  df-fv 6539
This theorem is used by:  bitsval  16574  subcrcl  17971  initorcl  18145  termorcl  18146  zeroorcl  18147  submrcl  18977  issubg  19316  isnsg  19345  issubrng  20779  issubrg  20803  issdrg  21025  abvrcl  21050  isobs  22006  mhprcl  22444  islocfin  23816  kgeni  23836  elmptrab  24126  isphtpc  25295  cfili  25569  cfilfcls  25575  plybss  26492  eleenn  29456  neircl  49957  sectrcl  50074  invrcl  50076  isorcl  50085  sectpropdlem  50088  invpropdlem  50090  isopropdlem  50092  lmdrcl  50703  cmdrcl  50704  lmdfval2  50707  cmdfval2  50708
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