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Theorem mptrel 4910
Description: The maps-to notation always describes a relationship. (Contributed by Scott Fenton, 16-Apr-2012.)
Assertion
Ref Expression
mptrel Rel (𝑥 ∈ 𝐴 ↦ 𝐵)

Proof of Theorem mptrel
Dummy variable 𝑦 is distinct from all other variables.
StepHypRef Expression
1 df-mpt 4195 . 2 (𝑥 ∈ 𝐴 ↦ 𝐵) = {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ 𝐴 ∧ 𝑦 = 𝐵)}
21relopabi 4907 1 Rel (𝑥 ∈ 𝐴 ↦ 𝐵)
Colors of variables:    wff set class
This proof depends on syntax axioms:   ∧ wa 104   = wceq 1402   ∈ wcel 2209   ↦ cmpt 4193  Rel wrel 4781
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4251  ax-pow 4313  ax-pr 4348
This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-opab 4194  df-mpt 4195  df-xp 4782  df-rel 4783
This theorem is used by:  swrd0g  11455  cntzrcl  14160  opprringb  14496  rrgmex  14679  lssmex  14802  2idlmex  14948  asclfval  15131  cnprcl2k  15444  psmetrel  15560  metrel  15580  xmetrel  15581  xmetf  15588  mopnrel  15679
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