let A be closed-interval Subset of REAL ; :: thesis: for f being Function of A,REAL
for T being DivSequence of A
for S being middle_volume_Sequence of f,T
for i being Element of NAT st f | A is bounded_above holds
(middle_sum f,S) . i <= (upper_sum f,T) . i
let f be Function of A,REAL ; :: thesis: for T being DivSequence of A
for S being middle_volume_Sequence of f,T
for i being Element of NAT st f | A is bounded_above holds
(middle_sum f,S) . i <= (upper_sum f,T) . i
let T be DivSequence of A; :: thesis: for S being middle_volume_Sequence of f,T
for i being Element of NAT st f | A is bounded_above holds
(middle_sum f,S) . i <= (upper_sum f,T) . i
let S be middle_volume_Sequence of f,T; :: thesis: for i being Element of NAT st f | A is bounded_above holds
(middle_sum f,S) . i <= (upper_sum f,T) . i
let i be Element of NAT ; :: thesis: ( f | A is bounded_above implies (middle_sum f,S) . i <= (upper_sum f,T) . i )
assume A1: f | A is bounded_above ; :: thesis: (middle_sum f,S) . i <= (upper_sum f,T) . i
( (middle_sum f,S) . i = middle_sum f,(S . i) & (upper_sum f,T) . i = upper_sum f,(T . i) ) by Def4, INTEGRA2:def 4;
hence (middle_sum f,S) . i <= (upper_sum f,T) . i by A1, Th2; :: thesis: verum