Theorem dvdszrcl 12812

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

Assertion

Ref	Expression
dvdszrcl	|- ( X || Y -> ( X e. ZZ /\ Y e. ZZ ) )

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 12808	. . 3 |- || = { <. x , y >. | ( ( x e. ZZ /\ y e. ZZ ) /\ E. z e. ZZ ( z x. x ) = y ) }
2		opabssxp 4909	. . 3 |- { <. x , y >. | ( ( x e. ZZ /\ y e. ZZ ) /\ E. z e. ZZ ( z x. x ) = y ) } C_ ( ZZ X. ZZ )
3	1, 2	eqsstri 3338	. 2 |- || C_ ( ZZ X. ZZ )
4	3	brel 4885	1 |- ( X || Y -> ( X e. ZZ /\ Y e. ZZ ) )

Syntax hints:   -> wi 4   /\ wa 359   = wceq 1649   e. wcel 1721   E.wrex 2667   class class class wbr 4172   {copab 4225   X. cxp 4835  (class class class)co 6040   x. cmul 8951   ZZcz 10238   || cdivides 12807

This theorem is referenced by:  dvdsmulgcd  13009  oddvdsi  15141  odmulg  15147  gexdvdsi  15172

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1552  ax-5 1563  ax-17 1623  ax-9 1662  ax-8 1683  ax-14 1725  ax-6 1740  ax-7 1745  ax-11 1757  ax-12 1946  ax-ext 2385  ax-sep 4290  ax-nul 4298  ax-pr 4363

This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-3an 938  df-tru 1325  df-ex 1548  df-nf 1551  df-sb 1656  df-clab 2391  df-cleq 2397  df-clel 2400  df-nfc 2529  df-ne 2569  df-ral 2671  df-rex 2672  df-rab 2675  df-v 2918  df-dif 3283  df-un 3285  df-in 3287  df-ss 3294  df-nul 3589  df-if 3700  df-sn 3780  df-pr 3781  df-op 3783  df-br 4173  df-opab 4227  df-xp 4843  df-dvds 12808