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math.CO2016
Combinatorial characterization of upward planarity
Xuexing Lu, Yu Ye
We give a combinatorial characterization of upward planar graphs in terms of upward planar orders, which are special linear extensions of edge posets.
math.CO2016★ 1 cited
A graphical calculus for semi-groupal categories
Sen Hu, Xuexing Lu, Yu Ye
Around the year 1988, Joyal and Street established a graphical calculus for monoidal categories, which provides a firm foundation for many explorations of graphical notations in ma…