Theorem reli 3279

Description: The identity relation is a relation. Part of Exercise 4.12(p) of [Mendelson] p. 235.

Assertion

Ref	Expression
reli	⊢ Rel I

Proof of Theorem reli

Step	Hyp	Ref	Expression
1		relopab 3272	. 2 ⊢ Rel {⟨x, y⟩∣x = y}
2		df-id 2841	. . 3 ⊢ I = {⟨x, y⟩∣x = y}
3	2	releqi 3250	. 2 ⊢ (Rel I ↔ Rel {⟨x, y⟩∣x = y})
4	1, 3	mpbir 190	1 ⊢ Rel I

Syntax hints:   = wceq 958  {copab 2671  Icid 2837  Rel wrel 3181

This theorem is referenced by:  ideqg 3282  issetid 3286  iss 3403  intirr 3447  cnvi 3453  funi 3551  f1ovi 3724  idssen 4412

This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 964  ax-gen 965  ax-8 966  ax-10 968  ax-11 969  ax-12 970  ax-13 971  ax-14 972  ax-17 973  ax-4 975  ax-5o 977  ax-6o 980  ax-9o 1125  ax-10o 1142  ax-16 1212  ax-11o 1220  ax-ext 1462  ax-sep 2708  ax-pow 2748  ax-pr 2785

This theorem depends on definitions:  df-bi 147  df-or 224  df-an 225  df-ex 983  df-sb 1174  df-eu 1384  df-mo 1385  df-clab 1467  df-cleq 1472  df-clel 1475  df-ne 1590  df-v 1815  df-dif 2052  df-un 2053  df-in 2054  df-ss 2056  df-nul 2284  df-pw 2406  df-sn 2416  df-pr 2417  df-op 2420  df-opab 2672  df-id 2841  df-xp 3190  df-rel 3191

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