*! ( / * # + #/ # /
, %#/ 23.
# 23.
1. .* ( / #0+ ' * ( + * # P1,P2,…,Pn,… 03# #' 0 [a,b] ', ) limn®¥ diamPn = 0, #
#0+ ' * ( + * # 3 + ) X1 , X2 ,..., Xn ,... +! / */ * +#
limn®¥ S(Pn , Xn ; f ) = I.
;+ / */ # 1 * +#
a)3" (# !;
b)( * ) !;
c)3" (# ! # ( * ) !;
d)# 3" (# !, # ( * ) !
( / # & # * # # $ %## f 0 [a,b]?
2. .* $ %#/ f # & # # |
0 [a,b]. #, ) 3/0 +! / */ * +# |
"e > 0$d > 0"P , P "X |
, X |
2 |
0 < diamP < d # 0 < diamP < d |
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S (P , X |
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3. .* ( / $ %## f 0 [a,b] +! / */ * +#
"e > 0$d > 0"P , P "X |
, X |
0 < diamP < d # 0 < diamP < d |
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S (P , X |
; f ) - S (P , X |
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#, ) $ %#/ f 3/0 # & # # 0 [a,b]?
4. .* $ %#/ f & #) 0 [a,b] # P={x0,x1,x2,…,xn-1,xn} - 03# # 0 [a,b]. 3 0 )#
mk = inf f (x), Dk = [xk -1 , xk ], k =1,2,...n.
xÎDk
n
S (P; f ) = mk Dk .
k =1
. ( 2#, ) P', P' É P, - 3 * + # * P 03# # 0 [a,b]. #0 * ( 6#" * +#' 3/0 +! / */
a)S (P'; f ) £ S (P; f );
b)S (P'; f ) ³ S (P; f );
356