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Theorem cnvi 2634
Description: The converse of the identity relation. Theorem 3.7(ii) of [Monk1] p. 36.
Assertion
Ref Expression
cnvi I = I

Proof of Theorem cnvi
StepHypRef Expression
1 relcnv 2624 . 2 Rel I
2 reli 2500 . 2 Rel I
3 cleqcom 1103 . . 3 (x = yy = x)
4 df-br 2063 . . . 4 (xIy ↔ ⟨x, y⟩ ∈ I)
5 visset 1350 . . . . 5 xV
6 visset 1350 . . . . 5 yV
75, 6ideq 2127 . . . 4 (xIyx = y)
84, 7bitr3 153 . . 3 (⟨x, y⟩ ∈ Ix = y)
95, 6brcnv 2519 . . . 4 (xIyyIx)
10 df-br 2063 . . . 4 (xIy ↔ ⟨x, y⟩ ∈ I)
116, 5ideq 2127 . . . 4 (yIxy = x)
129, 10, 113bitr3 156 . . 3 (⟨x, y⟩ ∈ Iy = x)
133, 8, 123bitr4r 159 . 2 (⟨x, y⟩ ∈ I ↔ ⟨x, y⟩ ∈ I)
141, 2, 13cleqreli 2484 1 I = I
Colors of variables: wff set class
Syntax hints:   = weq 797   = wceq 1091   ∈ wcel 1092  ⟨cop 1810   class class class wbr 2054  Icid 2057  ccnv 2409
This theorem is referenced by:  coi2 2666  funi 2692  f1oi 2825  ssdomg 3311
This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6  ax-4 673  ax-5 674  ax-6 675  ax-7 676  ax-gen 677  ax-8 798  ax-9 799  ax-10 800  ax-11 801  ax-12 802  ax-13 804  ax-14 805  ax-16 922  ax-17 925  ax-ext 1074  ax-rep 1075  ax-pow 1077
This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-ex 679  df-sb 853  df-clab 1093  df-cleq 1097  df-clel 1099  df-v 1349  df-dif 1489  df-un 1490  df-in 1491  df-ss 1492  df-nul 1708  df-pw 1799  df-sn 1811  df-pr 1812  df-op 1815  df-br 2063  df-opab 2098  df-id 2125  df-xp 2424  df-rel 2425  df-cnv 2426
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