theorem Th56: :: INTEGR24:56

for f being PartFunc of REAL,REAL
for a, b being Real st a < b & [.a,b.[ c= dom f & f is_right_improper_integrable_on a,b holds
( - f is_right_improper_integrable_on a,b & right_improper_integral ((- f),a,b) = - (right_improper_integral (f,a,b)) )