Ã
Ã
F Ã X A, B, A1, A2, . . . " F
X " F
A\B " F
A )" B " F
"
An " F
n=1

{Ft}t"T Ã X F = Ft Ã
t"T
X
à A B A *" B Ã
F ‚" 2X Ã
X = {x1, x2, x3, x4} F = {", X, {x1}, {x2}, {x2, x3}, {x2, x3, x4}},
X = N F
A " F Ð!Ò! A X\A ,
X = R F
A " F Ð!Ò! A X\A ,
X = R F
A " F Ð!Ò! A X\A ,
X = R F
A " F Ð!Ò! [0, 1] ‚" A [0, 1] ‚" X\A.
 X M
X Ã
X F ‚" 2X F
Ã
F Ã X E ‚" X
FE = {A )" E : A " F}
à E
F Ã X E " F
FE = {A " F : A ‚" E}
à E
F R

F = A " 2R : A = " A )" Q = " .

F Ã R
F R F Ã
R