defpred S₁[ object ] means ex a being non negative Real ex R being Equivalence_Relation of X st
( R = (low_toler (f,a)) [*] & Class R = $1 );
A3: for X1, X2 being Subset of (PARTITIONS X) st ( for x being object holds
( x in X1 iff S₁[x] ) ) & ( for x being object holds
( x in X2 iff S₁[x] ) ) holds
X1 = X2 from LMOD_7:sch 1();
let X1, X2 be Subset of (PARTITIONS X); :: thesis: ( ( for x being object holds
( x in X1 iff ex a being non negative Real ex R being Equivalence_Relation of X st
( R = (low_toler (f,a)) [*] & Class R = x ) ) ) & ( for x being object holds
( x in X2 iff ex a being non negative Real ex R being Equivalence_Relation of X st
( R = (low_toler (f,a)) [*] & Class R = x ) ) ) implies X1 = X2 )
assume ( ( for x being object holds
( x in X1 iff ex a being non negative Real ex R being Equivalence_Relation of X st
( R = (low_toler (f,a)) [*] & Class R = x ) ) ) & ( for x being object holds
( x in X2 iff ex a being non negative Real ex R being Equivalence_Relation of X st
( R = (low_toler (f,a)) [*] & Class R = x ) ) ) ) ; :: thesis: X1 = X2
hence X1 = X2 by A3; :: thesis: verum