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Theorem mptrcl 7003
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 4285 . 2 (𝐼 ∈ (𝐹‘𝑋) → ¬ (𝐹‘𝑋) = ∅)
2 mptrcl.1 . . . . 5 𝐹 = (𝑥 ∈ 𝐴 ↦ 𝐵)
32dmmptss 6242 . . . 4 dom 𝐹 ⊆ 𝐴
43sseli 3904 . . 3 (𝑋 ∈ dom 𝐹 → 𝑋 ∈ 𝐴)
5 ndmfv 6917 . . 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 1569   ∈ wcel 2144  ∅c0 4278   ↦ cmpt 5185  dom cdm 5650  ‘cfv 6538
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2212  ax-ext 2732  ax-sep 5248  ax-nul 5259  ax-pr 5390
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2099  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-rab 3413  df-v 3452  df-ss 3896  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-sn 4585  df-pr 4587  df-op 4835  df-uni 4867  df-br 5103  df-opab 5167  df-mpt 5186  df-xp 5656  df-rel 5657  df-cnv 5658  df-dm 5660  df-rn 5661  df-res 5662  df-ima 5663  df-iota 6494  df-fv 6546
This theorem is used by:  bitsval  16599  subcrcl  17996  initorcl  18170  termorcl  18171  zeroorcl  18172  submrcl  19002  issubg  19341  isnsg  19370  issubrng  20804  issubrg  20828  issdrg  21050  abvrcl  21075  isobs  22031  mhprcl  22469  islocfin  23841  kgeni  23861  elmptrab  24151  isphtpc  25320  cfili  25594  cfilfcls  25600  plybss  26517  eleenn  29479  neircl  50112  sectrcl  50229  invrcl  50231  isorcl  50240  sectpropdlem  50243  invpropdlem  50245  isopropdlem  50247  lmdrcl  50927  cmdrcl  50928  lmdfval2  50931  cmdfval2  50932
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