Strange:
L=LatticePoset({0:['A', 'x', 'B'], 'A': ['y'], 'x': ['y', 'C'], 'B': ['C'],
'y': [1], 'C': [1]})
L.show(figsize=3, vertex_colors={'gray': [0,1,'x', 'y'], '#ff0000': ['A'], '#00ff00':
['B', 'C']}, title="$A \wedge B=1$ and $A \vee B=0$.")It seems that \wedge works, but \vee does not. Already documented bug? -- Jori Mäntysalo
