Theorem brco 5856

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 5852	. 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 1809   ∈ wcel 2143  Vcvv 3455   class class class wbr 5109   ∘ ccom 5665

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-ext 2735  ax-sep 5257  ax-pr 5404

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-sb 2097  df-clab 2742  df-cleq 2755  df-clel 2838  df-rab 3417  df-v 3457  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-nul 4287  df-if 4488  df-sn 4590  df-pr 4592  df-op 4596  df-br 5110  df-opab 5174  df-co 5670

This theorem is referenced by:  opelco  5857  cnvco  5875  cotrg  6111  resco  6251  imaco  6252  rnco  6253  rncoOLD  6254  coass  6267  dfpo2  6297  dffv2  6976  foeqcnvco  7298  f1eqcocnv  7299  ttrclss  9685  rtrclreclem3  15093  imasleval  17590  ustuqtop4  24401  metustexhalf  24713  dftr6  36243  coep  36244  coepr  36245  brtxp  36370  pprodss4v  36374  brpprod  36375  sscoid  36403  elfuns  36405  brimg  36427  brapply  36428  brcup  36429  brcap  36430  brsuccf  36432  funpartlem  36434  brrestrict  36441  dfrecs2  36442  dfrdg4  36443  cnvssco  44352  brpermmodel  45732  xpco2  49655