:: deftheorem Def5 defines Out_U_Inp AMISTD_4:def 5 :
for N being with_zero set
for A being non empty with_non-empty_values IC-Ins-separated AMI-Struct over N
for I being Instruction of A
for b₄ being Subset of A holds
( b₄ = Out_U_Inp I iff for o being Object of A holds
( o in b₄ iff ex s being State of A ex a being Element of Values o st Exec (I,(s +* (o,a))) <> (Exec (I,s)) +* (o,a) ) );