Theorem ec0 39512

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 8750	. 2 ⊢ [𝐴]∅ = (∅ “ {𝐴})
2		0ima 6214	. 2 ⊢ (∅ “ {𝐴}) = ∅
3	1, 2	eqtri 2786	1 ⊢ [𝐴]∅ = ∅

This proof depends on syntax axioms:   = wceq 1570  ∅c0 4281  {csn 4588   “ cima 5659  [cec 8746

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-ext 2735  ax-sep 5253  ax-pr 5396

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2102  df-clab 2742  df-cleq 2755  df-clel 2839  df-rab 3417  df-v 3456  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-sn 4589  df-pr 4591  df-op 4839  df-br 5107  df-opab 5172  df-xp 5662  df-rel 5663  df-cnv 5664  df-dm 5666  df-rn 5667  df-res 5668  df-ima 5669  df-ec 8750

This theorem is used by:  coss0  39704