Theorem eqvreldisj1 39431

Description: The elements of the quotient set of an equivalence relation are disjoint (cf. eqvreldisj2 39432, eqvreldisj3 39433). (Contributed by Mario Carneiro, 10-Dec-2016.) (Revised by Peter Mazsa, 3-Dec-2024.)

Assertion

Ref	Expression
eqvreldisj1	⊢ ( EqvRel 𝑅 → ∀𝑥 ∈ (𝐴 / 𝑅)∀𝑦 ∈ (𝐴 / 𝑅)(𝑥 = 𝑦 ∨ (𝑥 ∩ 𝑦) = ∅))

Distinct variable groups:   𝑦,𝐴   𝑥,𝑅,𝑦

Allowed substitution hint:   𝐴(𝑥)

Proof of Theorem eqvreldisj1

Step	Hyp	Ref	Expression
1		simpl 486	. . 3 ⊢ (( EqvRel 𝑅 ∧ (𝑥 ∈ (𝐴 / 𝑅) ∧ 𝑦 ∈ (𝐴 / 𝑅))) → EqvRel 𝑅)
2		simprl 780	. . 3 ⊢ (( EqvRel 𝑅 ∧ (𝑥 ∈ (𝐴 / 𝑅) ∧ 𝑦 ∈ (𝐴 / 𝑅))) → 𝑥 ∈ (𝐴 / 𝑅))
3		simprr 782	. . 3 ⊢ (( EqvRel 𝑅 ∧ (𝑥 ∈ (𝐴 / 𝑅) ∧ 𝑦 ∈ (𝐴 / 𝑅))) → 𝑦 ∈ (𝐴 / 𝑅))
4	1, 2, 3	qsdisjALTV 39203	. 2 ⊢ (( EqvRel 𝑅 ∧ (𝑥 ∈ (𝐴 / 𝑅) ∧ 𝑦 ∈ (𝐴 / 𝑅))) → (𝑥 = 𝑦 ∨ (𝑥 ∩ 𝑦) = ∅))
5	4	ralrimivva 3207	1 ⊢ ( EqvRel 𝑅 → ∀𝑥 ∈ (𝐴 / 𝑅)∀𝑦 ∈ (𝐴 / 𝑅)(𝑥 = 𝑦 ∨ (𝑥 ∩ 𝑦) = ∅))

Syntax hints:   → wi 4   ∧ wa 399   ∨ wo 858   = wceq 1562   ∈ wcel 2144  ∀wral 3078   ∩ cin 3905  ∅c0 4287   / cqs 8679   EqvRel weqvrel 38704

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1817  ax-4 1831  ax-5 1932  ax-6 1989  ax-7 2030  ax-8 2146  ax-9 2154  ax-ext 2736  ax-sep 5248  ax-pr 5392

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1101  df-tru 1565  df-fal 1575  df-ex 1802  df-sb 2093  df-clab 2743  df-cleq 2756  df-clel 2839  df-ne 2960  df-ral 3079  df-rex 3089  df-rab 3417  df-v 3458  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4288  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-br 5103  df-opab 5165  df-id 5544  df-xp 5655  df-rel 5656  df-cnv 5657  df-co 5658  df-dm 5659  df-rn 5660  df-res 5661  df-ima 5662  df-ec 8682  df-qs 8686  df-refrel 39096  df-symrel 39128  df-trrel 39162  df-eqvrel 39173

This theorem is referenced by:  eqvreldisj2  39432