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Theorem brco 5848
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
StepHypRef Expression
1 opelco.1 . 2 𝐴 ∈ V
2 opelco.2 . 2 𝐵 ∈ V
3 brcog 5844 . 2 ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (𝐴(𝐶 ∘ 𝐷)𝐵 ↔ ∃𝑥(𝐴𝐷𝑥 ∧ 𝑥𝐶𝐵)))
41, 2, 3mp2an 705 1 (𝐴(𝐶 ∘ 𝐷)𝐵 ↔ ∃𝑥(𝐴𝐷𝑥 ∧ 𝑥𝐶𝐵))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   ↔ wb 209   ∧ wa 401  ∃wex 1812   ∈ wcel 2145  Vcvv 3451   class class class wbr 5103   ∘ ccom 5655
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 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2733  ax-sep 5249  ax-pr 5391
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2740  df-cleq 2753  df-clel 2836  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-br 5104  df-opab 5168  df-co 5660
This theorem is used by:  opelco  5849  cnvco  5867  cotrg  6105  resco  6251  imaco  6252  rnco  6253  rncoOLD  6254  coass  6267  dfpo2  6299  dffv2  6980  foeqcnvco  7308  f1eqcocnv  7309  ttrclss  9721  rtrclreclem3  15213  imasleval  17713  ustuqtop4  24563  metustexhalf  24875  dftr6  36516  coep  36517  coepr  36518  brtxp  36642  pprodss4v  36646  brpprod  36647  sscoid  36675  elfuns  36677  brimg  36699  brapply  36700  brcup  36701  brcap  36702  brsuccf  36704  funpartlem  36706  brrestrict  36713  dfrecs2  36714  dfrdg4  36715  cnvssco  44605  cocanss2  45921  brpermmodel  45992  xpco2  49966
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