theorem Th6: :: SFMASTR1:7

for p being Instruction-Sequence of SCM+FSA
for s being State of SCM+FSA
for a being Int-Location
for Ig being good really-closed Program of SCM+FSA
for J being really-closed Program of SCM+FSA st ( Ig is parahalting or Ig is_halting_on Initialized s,p ) & ( J is parahalting or J is_halting_on IExec (Ig,p,s),p ) holds
(IExec ((Ig ";" J),p,s)) . a = (IExec (J,p,(IExec (Ig,p,s)))) . a