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Theorem mptrcl 7000
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 = (𝑥𝐴𝐵)
Assertion
Ref Expression
mptrcl (𝐼 ∈ (𝐹𝑋) → 𝑋𝐴)
Distinct variable group:   𝑥,𝐴
Allowed substitution hints:   𝐵(𝑥)   𝐹(𝑥)   𝐼(𝑥)   𝑋(𝑥)

Proof of Theorem mptrcl
StepHypRef Expression
1 n0i 4289 . 2 (𝐼 ∈ (𝐹𝑋) → ¬ (𝐹𝑋) = ∅)
2 mptrcl.1 . . . . 5 𝐹 = (𝑥𝐴𝐵)
32dmmptss 6241 . . . 4 dom 𝐹𝐴
43sseli 3930 . . 3 (𝑋 ∈ dom 𝐹𝑋𝐴)
5 ndmfv 6914 . . 3 𝑋 ∈ dom 𝐹 → (𝐹𝑋) = ∅)
64, 5nsyl4 159 . 2 (¬ (𝐹𝑋) = ∅ → 𝑋𝐴)
71, 6syl 18 1 (𝐼 ∈ (𝐹𝑋) → 𝑋𝐴)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  ¬ wn 3  wi 4   = wceq 1570  wcel 2145  c0 4282  cmpt 5190  dom cdm 5659  cfv 6537
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 2215  ax-ext 2734  ax-sep 5255  ax-nul 5267  ax-pr 5402
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 2566  df-eu 2596  df-clab 2741  df-cleq 2754  df-clel 2837  df-nfc 2911  df-ne 2958  df-rab 3415  df-v 3455  df-dif 3905  df-un 3907  df-in 3909  df-ss 3919  df-nul 4283  df-if 4486  df-sn 4588  df-pr 4590  df-op 4594  df-uni 4871  df-br 5108  df-opab 5172  df-mpt 5191  df-xp 5665  df-rel 5666  df-cnv 5667  df-dm 5669  df-rn 5670  df-res 5671  df-ima 5672  df-iota 6493  df-fv 6545
This theorem is used by:  bitsval  16520  subcrcl  17911  initorcl  18085  termorcl  18086  zeroorcl  18087  submrcl  18916  issubg  19255  isnsg  19284  issubrng  20715  issubrg  20739  issdrg  20960  abvrcl  20985  isobs  21939  mhprcl  22377  islocfin  23749  kgeni  23769  elmptrab  24059  isphtpc  25228  cfili  25502  cfilfcls  25508  plybss  26426  eleenn  29361  neircl  49839  sectrcl  49956  invrcl  49958  isorcl  49967  sectpropdlem  49970  invpropdlem  49972  isopropdlem  49974  lmdrcl  50585  cmdrcl  50586  lmdfval2  50589  cmdfval2  50590
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