let L1, L2 be LATTICE; :: thesis: ( RelStr(# the carrier of L1,the InternalRel of L1 #) = RelStr(# the carrier of L2,the InternalRel of L2 #) implies for x being set st x is prime Ideal of L1 holds
x is prime Ideal of L2 )
assume A1: RelStr(# the carrier of L1,the InternalRel of L1 #) = RelStr(# the carrier of L2,the InternalRel of L2 #) ; :: thesis: for x being set st x is prime Ideal of L1 holds
x is prime Ideal of L2
let x be set ; :: thesis: ( x is prime Ideal of L1 implies x is prime Ideal of L2 )
assume x is prime Ideal of L1 ; :: thesis: x is prime Ideal of L2
then reconsider I = x as prime Ideal of L1 ;
reconsider I' = I as Subset of L2 by A1;
reconsider I' = I' as Ideal of L2 by A1, WAYBEL_0:3, WAYBEL_0:25;
I' is prime

proof

let x, y be Element of L2; :: according to WAYBEL_7:def 1 :: thesis: ( not x "/\" y in I' or x in I' or y in I' )
reconsider a = x, b = y as Element of L1 by A1;
( ex_inf_of {a,b},L1 & a "/\" b = inf {a,b} & x "/\" y = inf {x,y} ) by YELLOW_0:21, YELLOW_0:40;
then a "/\" b = x "/\" y by A1, YELLOW_0:27;
hence ( not x "/\" y in I' or x in I' or y in I' ) by Def1; :: thesis: verum

end;

hence x is prime Ideal of L2 ; :: thesis: verum