Theorem brstruct 17352

Description: The structure relation is a relation. (Contributed by Mario Carneiro, 29-Aug-2015.)

Assertion

Ref	Expression
brstruct	⊢ Rel Struct

Proof of Theorem brstruct

Dummy variables 𝑥 𝑓 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-struct 17351	. 2 ⊢ Struct = {⟨𝑓, 𝑥⟩ ∣ (𝑥 ∈ ( ≤ ∩ (ℕ × ℕ)) ∧ Fun (𝑓 ∖ {∅}) ∧ dom 𝑓 ⊆ (...‘𝑥))}
2	1	relopabiv 5803	1 ⊢ Rel Struct

This proof depends on syntax axioms:   ∧ w3a 1103   ∈ wcel 2147   ⊆ wss 3900   ∖ cdif 4048   ∩ cin 4092  ∅c0 4281  {csn 4588   × cxp 5653  dom cdm 5655  Rel wrel 5660  Fun wfun 6549  ‘cfv 6555   ≤ cle 11368  ℕcn 12359  ...cfz 13663   Struct cstr 17350

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 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-ext 2735

This proof depends on definitions:  df-bi 210  df-an 402  df-tru 1573  df-ex 1813  df-sb 2102  df-clab 2742  df-cleq 2755  df-clel 2839  df-v 3456  df-ss 3901  df-opab 5171  df-xp 5661  df-rel 5662  df-struct 17351

This theorem is used by:  isstruct2  17353  structex  17354  ishfstruct  46224