拟阵(M-Z_1)/Z_2在Z^+中的(F-Z_1)-可流性

(F-Z_1)-Flowability of Matroid (M-Z_1)/Z_2 in Z^+

研究幼阵M′在Z+中的F′-可流性。首先给出M是一个在Z+中的F-可流拟阵的定义,由定义证明了,若对任意的非负整数函数p′,使得当对任意D′∈C M′*都有p′D′∩F′≤p′D′-F′被满足时,总可以找到满足∑e∈C′,C′∈C′F′Φ′C′≥p′e,若e∈F-Z1,∑e∈C′,C′∈CΦ′C′≤p′e,若e∈E-F-Z1。的非负整数值函数Φ′C′;E→Z+,从而M′是在Z+的F′-可流拟阵。

the F′-flowability of minor M′in Z＋ is studied.First,the definition of M being a F-flowing in Z＋ is given,Then,by the definition we prove that if for every nonnegative integeral valued function p′,and for every D′∈C M′＊implying p′D′∩F′≤p′D′-F′,then a nonnegative integeral valued function Φ′C′;E→Z＋ can be find,which satisfy ∑e∈C′,C′∈C′ F′Φ′C′≥p′e,ife∈F-Z1,∑Φ′C′≤p′e,ife∈E-F-Z1.,then M′is aF′-flowing in Z＋.