Theorem dvdszrcl 16277

Description: Reverse closure for the divisibility relation. (Contributed by Stefan O'Rear, 5-Sep-2015.)

Assertion

Ref	Expression
dvdszrcl	⊢ (𝑋 ∥ 𝑌 → (𝑋 ∈ ℤ ∧ 𝑌 ∈ ℤ))

Proof of Theorem dvdszrcl

Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-dvds 16273	. . 3 ⊢ ∥ = {⟨𝑥, 𝑦⟩ ∣ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ) ∧ ∃𝑧 ∈ ℤ (𝑧 · 𝑥) = 𝑦)}
2		opabssxp 5747	. . 3 ⊢ {⟨𝑥, 𝑦⟩ ∣ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ) ∧ ∃𝑧 ∈ ℤ (𝑧 · 𝑥) = 𝑦)} ⊆ (ℤ × ℤ)
3	1, 2	eqsstri 4005	. 2 ⊢ ∥ ⊆ (ℤ × ℤ)
4	3	brel 5719	1 ⊢ (𝑋 ∥ 𝑌 → (𝑋 ∈ ℤ ∧ 𝑌 ∈ ℤ))

Syntax hints:   → wi 4   ∧ wa 395   = wceq 1540   ∈ wcel 2108  ∃wrex 3060   class class class wbr 5119  {copab 5181   × cxp 5652  (class class class)co 7405   · cmul 11134  ℤcz 12588   ∥ cdvds 16272

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-ext 2707  ax-sep 5266  ax-nul 5276  ax-pr 5402

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-sb 2065  df-clab 2714  df-cleq 2727  df-clel 2809  df-ral 3052  df-rex 3061  df-rab 3416  df-v 3461  df-dif 3929  df-un 3931  df-ss 3943  df-nul 4309  df-if 4501  df-sn 4602  df-pr 4604  df-op 4608  df-br 5120  df-opab 5182  df-xp 5660  df-dvds 16273

This theorem is referenced by:  dvdsmod0  16278  p1modz1  16279  dvdsmodexp  16280  dvdsaddre2b  16326  dvdsabseq  16332  divconjdvds  16334  evenelz  16355  4dvdseven  16392  dfgcd2  16565  dvdsmulgcd  16575  dvdsnprmd  16709  dvdszzq  16740  oddvdsi  19529  odmulg  19537  gexdvdsi  19564  dvdschrmulg  21489  nnproddivdvdsd  42013  lcmineqlem14  42055  aks6d1c6isolem3  42189  grpods  42207  nzss  44341  nzin  44342