Theorem mptrel 5803

Description: The maps-to notation always describes a binary relation. (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.

Step	Hyp	Ref	Expression
1		df-mpt 5186	. 2 ⊢ (𝑥 ∈ 𝐴 ↦ 𝐵) = {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ 𝐴 ∧ 𝑦 = 𝐵)}
2	1	relopabiv 5798	1 ⊢ Rel (𝑥 ∈ 𝐴 ↦ 𝐵)

This proof depends on syntax axioms:   ∧ wa 401   = wceq 1569   ∈ wcel 2144   ↦ cmpt 5185  Rel wrel 5655

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-ext 2732

This proof depends on definitions:  df-bi 210  df-an 402  df-tru 1572  df-ex 1812  df-sb 2099  df-clab 2739  df-cleq 2752  df-clel 2835  df-v 3452  df-ss 3897  df-opab 5167  df-mpt 5186  df-xp 5656  df-rel 5657

This theorem is used by:  fmptco  7133  swrd0  14814  pmtrsn  19740  00lsp  21263  fmptcof2  33300  dfbigcup2  36755  imageval  36786  relqmap  39491  iscard4  44641