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Theorem f1ococnv1 6855
Description: The composition of a one-to-one onto function's converse and itself equals the identity relation restricted to the function's domain. (Contributed by NM, 13-Dec-2003.)
Assertion
Ref Expression
f1ococnv1 (𝐹:𝐴–1-1-onto→𝐵 → (◡𝐹 ∘ 𝐹) = ( I ↾ 𝐴))

Proof of Theorem f1ococnv1
StepHypRef Expression
1 f1orel 6828 . . . 4 (𝐹:𝐴–1-1-onto→𝐵 → Rel 𝐹)
2 dfrel2 6180 . . . 4 (Rel 𝐹 ↔ ◡◡𝐹 = 𝐹)
31, 2sylib 221 . . 3 (𝐹:𝐴–1-1-onto→𝐵 → ◡◡𝐹 = 𝐹)
43coeq2d 5839 . 2 (𝐹:𝐴–1-1-onto→𝐵 → (◡𝐹 ∘ ◡◡𝐹) = (◡𝐹 ∘ 𝐹))
5 f1ocnv 6838 . . 3 (𝐹:𝐴–1-1-onto→𝐵 → ◡𝐹:𝐵–1-1-onto→𝐴)
6 f1ococnv2 6853 . . 3 (◡𝐹:𝐵–1-1-onto→𝐴 → (◡𝐹 ∘ ◡◡𝐹) = ( I ↾ 𝐴))
75, 6syl 18 . 2 (𝐹:𝐴–1-1-onto→𝐵 → (◡𝐹 ∘ ◡◡𝐹) = ( I ↾ 𝐴))
84, 7eqtr3d 2797 1 (𝐹:𝐴–1-1-onto→𝐵 → (◡𝐹 ∘ 𝐹) = ( I ↾ 𝐴))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   = wceq 1569   I cid 5544  ◡ccnv 5649   ↾ cres 5652   ∘ ccom 5654  Rel wrel 5655  –1-1-onto→wf1o 6538
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  ax-sep 5248  ax-pr 5390
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-sb 2099  df-clab 2739  df-cleq 2752  df-clel 2835  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-ss 3896  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-sn 4585  df-pr 4587  df-op 4835  df-br 5103  df-opab 5167  df-id 5545  df-xp 5656  df-rel 5657  df-cnv 5658  df-co 5659  df-dm 5660  df-rn 5661  df-res 5662  df-fun 6541  df-fn 6542  df-f 6543  df-f1 6544  df-fo 6545  df-f1o 6546
This theorem is used by:  f1cocnv1  6856  f1ocnvfv1  7285  fcof1oinvd  7302  mapen  9164  mapfien  9404  hashfacen  14603  setcinv  18271  catcisolem  18291  symggrp  19620  f1omvdco2  19668  rngcinv  20895  ringcinv  20929  pf1mpf  22676  ufldom  24287  motgrp  29012  fmptco1f1o  33275  fcobij  33359  cocnvf1o  33368  symgfcoeu  33690  pmtrcnel2  33698  cycpmconjslem1  33762  cycpmconjslem2  33763  reprpmtf1o  35302  subfacp1lem5  36036  ltrncoidN  41279  trlcoabs2N  41873  trlcoat  41874  trlcone  41879  cdlemg47  41887  tgrpgrplem  41900  tendoipl  41948  cdlemi2  41970  cdlemk2  41983  cdlemk4  41985  cdlemk8  41989  tendocnv  42172  dvhgrp  42258  cdlemn8  42355  dihopelvalcpre  42399  aks6d1c6lem5  43321  dssmap2d  45116  rngcinvALTV  49467  ringcinvALTV  49501
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