Theorem dvdszrcl 12862

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 12858	. . 3 |- || = { <. x , y >. | ( ( x e. ZZ /\ y e. ZZ ) /\ E. z e. ZZ ( z x. x ) = y ) }
2		opabssxp 4953	. . 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 3380	. 2 |- || C_ ( ZZ X. ZZ )
4	3	brel 4929	1 |- ( X || Y -> ( X e. ZZ /\ Y e. ZZ ) )

Syntax hints:   -> wi 4   /\ wa 360   = wceq 1653   e. wcel 1726   E.wrex 2708   class class class wbr 4215   {copab 4268   X. cxp 4879  (class class class)co 6084   x. cmul 9000   ZZcz 10287   || cdivides 12857

This theorem is referenced by:  dvdsmulgcd  13059  oddvdsi  15191  odmulg  15197  gexdvdsi  15222

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1556  ax-5 1567  ax-17 1627  ax-9 1667  ax-8 1688  ax-14 1730  ax-6 1745  ax-7 1750  ax-11 1762  ax-12 1951  ax-ext 2419  ax-sep 4333  ax-nul 4341  ax-pr 4406

This theorem depends on definitions:  df-bi 179  df-or 361  df-an 362  df-3an 939  df-tru 1329  df-ex 1552  df-nf 1555  df-sb 1660  df-clab 2425  df-cleq 2431  df-clel 2434  df-nfc 2563  df-ne 2603  df-ral 2712  df-rex 2713  df-rab 2716  df-v 2960  df-dif 3325  df-un 3327  df-in 3329  df-ss 3336  df-nul 3631  df-if 3742  df-sn 3822  df-pr 3823  df-op 3825  df-br 4216  df-opab 4270  df-xp 4887  df-dvds 12858