Theorem symdifxor 3347

Description: Expressing symmetric difference with exclusive-or or two differences. (Contributed by Jim Kingdon, 28-Jul-2018.)

Assertion

Ref	Expression
symdifxor	|- ( ( A \ B ) u. ( B \ A ) ) = { x | ( x e. A \/_ x e. B ) }

Distinct variable groups:   x, A   x, B

Proof of Theorem symdifxor

Step	Hyp	Ref	Expression
1		eldif 3085	. . . 4 |- ( x e. ( A \ B ) <-> ( x e. A /\ -. x e. B ) )
2		eldif 3085	. . . 4 |- ( x e. ( B \ A ) <-> ( x e. B /\ -. x e. A ) )
3	1, 2	orbi12i 754	. . 3 |- ( ( x e. ( A \ B ) \/ x e. ( B \ A ) ) <-> ( ( x e. A /\ -. x e. B ) \/ ( x e. B /\ -. x e. A ) ) )
4		elun 3222	. . 3 |- ( x e. ( ( A \ B ) u. ( B \ A ) ) <-> ( x e. ( A \ B ) \/ x e. ( B \ A ) ) )
5		excxor 1357	. . . 4 |- ( ( x e. A \/_ x e. B ) <-> ( ( x e. A /\ -. x e. B ) \/ ( -. x e. A /\ x e. B ) ) )
6		ancom 264	. . . . 5 |- ( ( -. x e. A /\ x e. B ) <-> ( x e. B /\ -. x e. A ) )
7	6	orbi2i 752	. . . 4 |- ( ( ( x e. A /\ -. x e. B ) \/ ( -. x e. A /\ x e. B ) ) <-> ( ( x e. A /\ -. x e. B ) \/ ( x e. B /\ -. x e. A ) ) )
8	5, 7	bitri 183	. . 3 |- ( ( x e. A \/_ x e. B ) <-> ( ( x e. A /\ -. x e. B ) \/ ( x e. B /\ -. x e. A ) ) )
9	3, 4, 8	3bitr4i 211	. 2 |- ( x e. ( ( A \ B ) u. ( B \ A ) ) <-> ( x e. A \/_ x e. B ) )
10	9	abbi2i 2255	1 |- ( ( A \ B ) u. ( B \ A ) ) = { x | ( x e. A \/_ x e. B ) }

Syntax hints:   -. wn 3   /\ wa 103   \/ wo 698   = wceq 1332   \/_ wxo 1354   e. wcel 1481   {cab 2126   \ cdif 3073   u. cun 3074

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1483  ax-10 1484  ax-11 1485  ax-i12 1486  ax-bndl 1487  ax-4 1488  ax-17 1507  ax-i9 1511  ax-ial 1515  ax-i5r 1516  ax-ext 2122

This theorem depends on definitions:  df-bi 116  df-tru 1335  df-xor 1355  df-nf 1438  df-sb 1737  df-clab 2127  df-cleq 2133  df-clel 2136  df-nfc 2271  df-v 2691  df-dif 3078  df-un 3080

This theorem is referenced by: (None)