let R be good Ring; :: thesis: for a, b being Data-Location of R holds (product" (AddressParts (InsCode (a := b)))) . 2 = SCM-Data-Loc
let a, b be Data-Location of R; :: thesis: (product" (AddressParts (InsCode (a := b)))) . 2 = SCM-Data-Loc
A1: InsCode (a := b) = 1 by MCART_1:def 1;
then dom (product" (AddressParts (InsCode (a := b)))) = {1,2} by Th33;
then A2: 2 in dom (product" (AddressParts (InsCode (a := b)))) by TARSKI:def 2;

hereby :: according to TARSKI:def 3,XBOOLE_0:def 10 :: thesis: SCM-Data-Loc c= (product" (AddressParts (InsCode (a := b)))) . 2

let x be set ; :: thesis: ( x in (product" (AddressParts (InsCode (a := b)))) . 2 implies x in SCM-Data-Loc )
assume x in (product" (AddressParts (InsCode (a := b)))) . 2 ; :: thesis: x in SCM-Data-Loc
then x in pi (AddressParts (InsCode (a := b))),2 by A2, CARD_3:def 13;
then consider f being Function such that
A3: f in AddressParts (InsCode (a := b)) and
A4: f . 2 = x by CARD_3:def 6;
consider I being Instruction of (SCM R) such that
A5: f = AddressPart I and
A6: InsCode I = InsCode (a := b) by A3;
InsCode I = 1 by A6, MCART_1:def 1;
then consider d1, d2 being Data-Location of R such that
A7: I = d1 := d2 by Th17;
x = <*d1,d2*> . 2 by A4, A5, A7, MCART_1:def 2
.= d2 by FINSEQ_1:61 ;
hence x in SCM-Data-Loc by SCMRING2:1; :: thesis: verum

end;

let x be set ; :: according to TARSKI:def 3 :: thesis: ( not x in SCM-Data-Loc or x in (product" (AddressParts (InsCode (a := b)))) . 2 )
assume x in SCM-Data-Loc ; :: thesis: x in (product" (AddressParts (InsCode (a := b)))) . 2
then reconsider x = x as Data-Location of R by SCMRING2:1;
consider d1 being Data-Location of R;
InsCode (d1 := x) = 1 by MCART_1:def 1;
then AddressPart (d1 := x) in AddressParts (InsCode (a := b)) by A1;
then A8: (AddressPart (d1 := x)) . 2 in pi (AddressParts (InsCode (a := b))),2 by CARD_3:def 6;
(AddressPart (d1 := x)) . 2 = <*d1,x*> . 2 by MCART_1:def 2
.= x by FINSEQ_1:61 ;
hence x in (product" (AddressParts (InsCode (a := b)))) . 2 by A2, A8, CARD_3:def 13; :: thesis: verum