Theorem uniqs2 8818

Description: The union of a quotient set. (Contributed by Mario Carneiro, 11-Jul-2014.)

Hypotheses

Ref	Expression
qsss.1	⊢ (𝜑 → 𝑅 Er 𝐴)
qsss.2	⊢ (𝜑 → 𝑅 ∈ 𝑉)

Assertion

Ref	Expression
uniqs2	⊢ (𝜑 → ∪ (𝐴 / 𝑅) = 𝐴)

Proof of Theorem uniqs2

Step	Hyp	Ref	Expression
1		qsss.2	. . . . 5 ⊢ (𝜑 → 𝑅 ∈ 𝑉)
2		uniqs 8816	. . . . 5 ⊢ (𝑅 ∈ 𝑉 → ∪ (𝐴 / 𝑅) = (𝑅 “ 𝐴))
3	1, 2	syl 17	. . . 4 ⊢ (𝜑 → ∪ (𝐴 / 𝑅) = (𝑅 “ 𝐴))
4		qsss.1	. . . . . 6 ⊢ (𝜑 → 𝑅 Er 𝐴)
5		erdm 8754	. . . . . 6 ⊢ (𝑅 Er 𝐴 → dom 𝑅 = 𝐴)
6	4, 5	syl 17	. . . . 5 ⊢ (𝜑 → dom 𝑅 = 𝐴)
7	6	imaeq2d 6080	. . . 4 ⊢ (𝜑 → (𝑅 “ dom 𝑅) = (𝑅 “ 𝐴))
8	3, 7	eqtr4d 2778	. . 3 ⊢ (𝜑 → ∪ (𝐴 / 𝑅) = (𝑅 “ dom 𝑅))
9		imadmrn 6090	. . 3 ⊢ (𝑅 “ dom 𝑅) = ran 𝑅
10	8, 9	eqtrdi 2791	. 2 ⊢ (𝜑 → ∪ (𝐴 / 𝑅) = ran 𝑅)
11		errn 8766	. . 3 ⊢ (𝑅 Er 𝐴 → ran 𝑅 = 𝐴)
12	4, 11	syl 17	. 2 ⊢ (𝜑 → ran 𝑅 = 𝐴)
13	10, 12	eqtrd 2775	1 ⊢ (𝜑 → ∪ (𝐴 / 𝑅) = 𝐴)

Syntax hints:   → wi 4   = wceq 1537   ∈ wcel 2106  ∪ cuni 4912  dom cdm 5689  ran crn 5690   “ cima 5692   Er wer 8741   / cqs 8743

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1908  ax-6 1965  ax-7 2005  ax-8 2108  ax-9 2116  ax-11 2155  ax-ext 2706  ax-sep 5302  ax-nul 5312  ax-pr 5438  ax-un 7754

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1540  df-fal 1550  df-ex 1777  df-sb 2063  df-clab 2713  df-cleq 2727  df-clel 2814  df-ral 3060  df-rex 3069  df-rab 3434  df-v 3480  df-dif 3966  df-un 3968  df-in 3970  df-ss 3980  df-nul 4340  df-if 4532  df-sn 4632  df-pr 4634  df-op 4638  df-uni 4913  df-iun 4998  df-br 5149  df-opab 5211  df-xp 5695  df-rel 5696  df-cnv 5697  df-dm 5699  df-rn 5700  df-res 5701  df-ima 5702  df-er 8744  df-ec 8746  df-qs 8750

This theorem is referenced by:  qshash  15860  cldsubg  24135  pi1buni  25087  qustrivr  33373