Theorem brco 5857

Description: Binary relation on a composition. (Contributed by NM, 21-Sep-2004.) (Revised by Mario Carneiro, 24-Feb-2015.)

Hypotheses

Ref	Expression
opelco.1	⊢ 𝐴 ∈ V
opelco.2	⊢ 𝐵 ∈ V

Assertion

Ref	Expression
brco	⊢ (𝐴(𝐶 ∘ 𝐷)𝐵 ↔ ∃𝑥(𝐴𝐷𝑥 ∧ 𝑥𝐶𝐵))

Distinct variable groups:   𝑥,𝐴   𝑥,𝐵   𝑥,𝐶   𝑥,𝐷

Proof of Theorem brco

Step	Hyp	Ref	Expression
1		opelco.1	. 2 ⊢ 𝐴 ∈ V
2		opelco.2	. 2 ⊢ 𝐵 ∈ V
3		brcog 5853	. 2 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (𝐴(𝐶 ∘ 𝐷)𝐵 ↔ ∃𝑥(𝐴𝐷𝑥 ∧ 𝑥𝐶𝐵)))
4	1, 2, 3	mp2an 704	1 ⊢ (𝐴(𝐶 ∘ 𝐷)𝐵 ↔ ∃𝑥(𝐴𝐷𝑥 ∧ 𝑥𝐶𝐵))

Syntax hints:   ↔ wb 209   ∧ wa 400  ∃wex 1806   ∈ wcel 2149  Vcvv 3463   class class class wbr 5113   ∘ ccom 5666

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-ext 2741  ax-sep 5261  ax-pr 5405

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-sb 2098  df-clab 2748  df-cleq 2761  df-clel 2844  df-rab 3424  df-v 3465  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-nul 4295  df-if 4493  df-sn 4595  df-pr 4597  df-op 4601  df-br 5114  df-opab 5178  df-co 5671

This theorem is referenced by:  opelco  5858  cnvco  5876  cotrg  6112  resco  6252  imaco  6253  rnco  6254  rncoOLD  6255  coass  6268  dfpo2  6298  dffv2  6977  foeqcnvco  7299  f1eqcocnv  7300  ttrclss  9689  rtrclreclem3  15097  imasleval  17595  ustuqtop4  24370  metustexhalf  24682  dftr6  36142  coep  36143  coepr  36144  brtxp  36269  pprodss4v  36273  brpprod  36274  sscoid  36302  elfuns  36304  brimg  36326  brapply  36327  brcup  36328  brcap  36329  brsuccf  36331  funpartlem  36333  brrestrict  36340  dfrecs2  36341  dfrdg4  36342  cnvssco  44224  brpermmodel  45604  xpco2  49520