:: deftheorem Def3 defines Output AMISTD_4:def 3 :
for N being with_zero set
for A being non empty with_non-empty_values AMI-Struct over N
for I being Instruction of A
for b₄ being Subset of A holds
( b₄ = Output I iff for o being Object of A holds
( o in b₄ iff ex s being State of A st s . o <> (Exec (I,s)) . o ) );