:: deftheorem Def13 defines TRS MSUALG_6:def 13 :
for S being non empty non void ManySortedSign
for A being non-empty MSAlgebra over S
for R being ManySortedRelation of the Sorts of A
for b₄ being invariant stable ManySortedRelation of A holds
( b₄ = TRS R iff ( R c= b₄ & ( for Q being invariant stable ManySortedRelation of A st R c= Q holds
b₄ c= Q ) ) );