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Theorem nfmpt 3878
 Description: Bound-variable hypothesis builder for the maps-to notation. (Contributed by NM, 20-Feb-2013.)
Hypotheses
Ref Expression
nfmpt.1 𝑥𝐴
nfmpt.2 𝑥𝐵
Assertion
Ref Expression
nfmpt 𝑥(𝑦𝐴𝐵)
Distinct variable group:   𝑥,𝑦
Allowed substitution hints:   𝐴(𝑥,𝑦)   𝐵(𝑥,𝑦)

Proof of Theorem nfmpt
Dummy variable 𝑧 is distinct from all other variables.
StepHypRef Expression
1 df-mpt 3849 . 2 (𝑦𝐴𝐵) = {⟨𝑦, 𝑧⟩ ∣ (𝑦𝐴𝑧 = 𝐵)}
2 nfmpt.1 . . . . 5 𝑥𝐴
32nfcri 2214 . . . 4 𝑥 𝑦𝐴
4 nfmpt.2 . . . . 5 𝑥𝐵
54nfeq2 2231 . . . 4 𝑥 𝑧 = 𝐵
63, 5nfan 1498 . . 3 𝑥(𝑦𝐴𝑧 = 𝐵)
76nfopab 3854 . 2 𝑥{⟨𝑦, 𝑧⟩ ∣ (𝑦𝐴𝑧 = 𝐵)}
81, 7nfcxfr 2217 1 𝑥(𝑦𝐴𝐵)
 Colors of variables: wff set class Syntax hints:   ∧ wa 102   = wceq 1285   ∈ wcel 1434  Ⅎwnfc 2207  {copab 3846   ↦ cmpt 3847 This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 663  ax-5 1377  ax-7 1378  ax-gen 1379  ax-ie1 1423  ax-ie2 1424  ax-8 1436  ax-10 1437  ax-11 1438  ax-i12 1439  ax-bndl 1440  ax-4 1441  ax-17 1460  ax-i9 1464  ax-ial 1468  ax-i5r 1469  ax-ext 2064 This theorem depends on definitions:  df-bi 115  df-tru 1288  df-nf 1391  df-sb 1687  df-clab 2069  df-cleq 2075  df-clel 2078  df-nfc 2209  df-opab 3848  df-mpt 3849 This theorem is referenced by:  nffrec  6045  nfsum1  10331  nfsum  10332
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