s ?s ???s?st??t ??t? t??s ?s???r???s? ??? t?? s??s? t??t t??r? ???sts, M ?s ?????? ?rr???????? ?? ? 2 (M ) ?s tr?????? ,
x, 1) = g(x)? f ?s s??? t ,
?t?????s ??? g : Y ? X s? t??t ? ? g = f ??? ?(y) = ? x????s ?s ?????? t?? ???t?, * : H i (S i ) ? H i (X)? ????? h i ([?]) = ? * ,