[131] The Modular Chromatic Number of Trees

[132] There is a non-van douwen mad family

[133] Generalization of the Topological Sum

[134] Generalizations on the Classical Problem‘Mice and the Poison’

[135] The relationship between the cubic function and their tangents and secants

[136] The Fractal of Branches

[137] Model Research of Soil Structure Based on Demand of Lightning Protection Grounding

[138] Curve Unfolding

[139] Counting, Classification and Graphic Design of Sudoku

[140] The Research on the Derangements Problem