let f be PartFunc of REAL,REAL; ( f is_integrable_on B-Meas implies ( f is_integrable_on L-Meas & Integral (B-Meas,f) = Integral (L-Meas,f) ) )
assume
f is_integrable_on B-Meas
; ( f is_integrable_on L-Meas & Integral (B-Meas,f) = Integral (L-Meas,f) )
then A1:
R_EAL f is_integrable_on B-Meas
by MESFUNC6:def 4;
hence
f is_integrable_on L-Meas
by Th38, MEASUR12:def 11, MEASUR12:def 12, MESFUNC6:def 4; Integral (B-Meas,f) = Integral (L-Meas,f)
( Integral (B-Meas,f) = Integral (B-Meas,(R_EAL f)) & Integral (L-Meas,f) = Integral (L-Meas,(R_EAL f)) )
by MESFUNC6:def 3;
hence
Integral (B-Meas,f) = Integral (L-Meas,f)
by A1, Th38, MEASUR12:def 11, MEASUR12:def 12; verum