Theorem reli 3263

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 3256	. 2 |- Rel {<.x, y>. | x = y}
2		df-id 2824	. . 3 |- I = {<.x, y>. | x = y}
3	2	releqi 3234	. 2 |- (Rel I <-> Rel {<.x, y>. | x = y})
4	1, 3	mpbir 190	1 |- Rel I

Syntax hints:   = wceq 953  {copab 2656  Icid 2820  Rel wrel 3165

This theorem is referenced by:  ideqg 3266  issetid 3269  iss 3381  intirr 3427  cnvi 3433  funi 3531  f1ovi 3703  idssen 4387

This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 959  ax-gen 960  ax-8 961  ax-10 963  ax-11 964  ax-12 965  ax-13 966  ax-14 967  ax-17 968  ax-4 970  ax-5o 972  ax-6o 975  ax-9o 1119  ax-10o 1136  ax-16 1206  ax-11o 1213  ax-ext 1452  ax-sep 2693  ax-pow 2732  ax-pr 2769

This theorem depends on definitions:  df-bi 147  df-or 224  df-an 225  df-ex 978  df-sb 1168  df-eu 1375  df-mo 1376  df-clab 1457  df-cleq 1462  df-clel 1465  df-ne 1579  df-v 1803  df-dif 2039  df-un 2040  df-in 2041  df-ss 2043  df-nul 2271  df-pw 2392  df-sn 2402  df-pr 2403  df-op 2406  df-opab 2657  df-id 2824  df-xp 3174  df-rel 3175

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