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Theorem ecidsn 6337
Description: An equivalence class modulo the identity relation is a singleton. (Contributed by NM, 24-Oct-2004.)
Assertion
Ref Expression
ecidsn [𝐴] I = {𝐴}

Proof of Theorem ecidsn
StepHypRef Expression
1 df-ec 6292 . 2 [𝐴] I = ( I “ {𝐴})
2 imai 4788 . 2 ( I “ {𝐴}) = {𝐴}
31, 2eqtri 2108 1 [𝐴] I = {𝐴}
Colors of variables: wff set class
Syntax hints:   = wceq 1289  {csn 3446   I cid 4115  cima 4441  [cec 6288
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 665  ax-5 1381  ax-7 1382  ax-gen 1383  ax-ie1 1427  ax-ie2 1428  ax-8 1440  ax-10 1441  ax-11 1442  ax-i12 1443  ax-bndl 1444  ax-4 1445  ax-14 1450  ax-17 1464  ax-i9 1468  ax-ial 1472  ax-i5r 1473  ax-ext 2070  ax-sep 3957  ax-pow 4009  ax-pr 4036
This theorem depends on definitions:  df-bi 115  df-3an 926  df-tru 1292  df-nf 1395  df-sb 1693  df-eu 1951  df-mo 1952  df-clab 2075  df-cleq 2081  df-clel 2084  df-nfc 2217  df-ral 2364  df-rex 2365  df-v 2621  df-un 3003  df-in 3005  df-ss 3012  df-pw 3431  df-sn 3452  df-pr 3453  df-op 3455  df-br 3846  df-opab 3900  df-id 4120  df-xp 4444  df-rel 4445  df-cnv 4446  df-dm 4448  df-rn 4449  df-res 4450  df-ima 4451  df-ec 6292
This theorem is referenced by: (None)
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