6.4.41 Graph theory

Condition: Build a graph on the matrix of incident. \ [B = \ Left (\ Begin {Array} {CCCCCC} 0 & 1 & 0 & 0 & 0 \\ -1 & 0 & 0 & 0 & 1 & 1 & -1 & 1 & 0 & 0 & 0 & --1 &1 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\ 0 & 0 & 0 & -1 & 1 \\ 0 & 0 & 1 & 0 & -1 \ End {Array} \ Right) \]