# 信息来源： 暂无 发布日期: 2019-06-18 浏览次数: $.ajax({type:'post',url:'/interFace/getDocReadCount.do?id=501865',timeout:2000,success:function(ret){$('#readcount').html($.trim(ret))},error:function(ret){$.ajax({type:'post',url:'/ecms_external?method=syncOfflineVisitCount',data:'type=doc&requestUrl='+location.href,timeout:2000,success:function(ret){$('#readcount').html(ret);},error:function(){$('#readcount').html(0);}});}});

It is clear that the set of columns in a matrix form a matroid, where a  subset of columns is independent if the columns are linearly independent. A  matroid is binary if it comes from a matrix over GF(2). In this talk, we will  show how to use bipartite graphs, called fundamental graphs, to represent binary  matroids and to study the class of binary matroids without certain minors.