id,summary,reporter,owner,description,type,status,priority,milestone,component,resolution,keywords,cc,merged,author,reviewer,upstream,work_issues,branch,commit,dependencies,stopgaps
7853,block_and_cut_vertices is inconsistent when graph has one vertex,jason,rlm,"Currently, block_and_cut_vertices says that the vertex in a single-vertex graph is a cut vertex:
{{{
sage: Graph(1).blocks_and_cut_vertices()
([0], [0])
}}}
According to the definition of cut vertices given in the documentation of the function, a cut vertex, when removed, increases the connected components of the graph. Either that documentation should be changed to mention a corner case, or (preferably), the above computation should look like:
{{{
sage: Graph(1).blocks_and_cut_vertices()
([0], [])
}}}
",defect,closed,major,sage-4.3.1,graph theory,fixed,,hartke rlm ncohen,sage-4.3.1.alpha2,Nathann Cohen,Robert Miller,N/A,,,,,