Theorem ecqs 8779

Description: Equivalence class in terms of quotient set. (Contributed by NM, 29-Jan-1999.)

Hypothesis

Ref	Expression
ecqs.1	⊢ 𝑅 ∈ V

Assertion

Ref	Expression
ecqs	⊢ [𝐴]𝑅 = ∪ ({𝐴} / 𝑅)

Proof of Theorem ecqs

Step	Hyp	Ref	Expression
1		df-ec 8698	. 2 ⊢ [𝐴]𝑅 = (𝑅 “ {𝐴})
2		ecqs.1	. . 3 ⊢ 𝑅 ∈ V
3		uniqsw 8774	. . 3 ⊢ (𝑅 ∈ V → ∪ ({𝐴} / 𝑅) = (𝑅 “ {𝐴}))
4	2, 3	ax-mp 5	. 2 ⊢ ∪ ({𝐴} / 𝑅) = (𝑅 “ {𝐴})
5	1, 4	eqtr4i 2786	1 ⊢ [𝐴]𝑅 = ∪ ({𝐴} / 𝑅)

This proof depends on syntax axioms:   = wceq 1570   ∈ wcel 2145  Vcvv 3450  {csn 4584  ∪ cuni 4867   “ cima 5658  [cec 8694   / cqs 8695

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 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-11 2194  ax-ext 2732  ax-sep 5251  ax-pr 5398  ax-un 7736

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 2100  df-clab 2739  df-cleq 2752  df-clel 2835  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-iun 4953  df-br 5104  df-opab 5168  df-xp 5661  df-rel 5662  df-cnv 5663  df-dm 5665  df-rn 5666  df-res 5667  df-ima 5668  df-ec 8698  df-qs 8702

This theorem is used by: (None)