Theorem ec0 38396

Description: The empty-coset of a class is the empty set. (Contributed by Peter Mazsa, 19-May-2019.)

Assertion

Ref	Expression
ec0	⊢ [𝐴]∅ = ∅

Proof of Theorem ec0

Step	Hyp	Ref	Expression
1		df-ec 8624	. 2 ⊢ [𝐴]∅ = (∅ “ {𝐴})
2		0ima 6027	. 2 ⊢ (∅ “ {𝐴}) = ∅
3	1, 2	eqtri 2754	1 ⊢ [𝐴]∅ = ∅

Syntax hints:   = wceq 1541  ∅c0 4283  {csn 4576   “ cima 5619  [cec 8620

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2113  ax-9 2121  ax-ext 2703  ax-sep 5234  ax-nul 5244  ax-pr 5370

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-sb 2068  df-clab 2710  df-cleq 2723  df-clel 2806  df-ral 3048  df-rex 3057  df-rab 3396  df-v 3438  df-dif 3905  df-un 3907  df-in 3909  df-ss 3919  df-nul 4284  df-if 4476  df-sn 4577  df-pr 4579  df-op 4583  df-br 5092  df-opab 5154  df-xp 5622  df-cnv 5624  df-dm 5626  df-rn 5627  df-res 5628  df-ima 5629  df-ec 8624

This theorem is referenced by:  coss0  38515