====== Mathematics ======
===== Useful =====
  * [[https://aimath.org/textbooks/approved-textbooks/|美国数学学会认可的教科书]]
  * [[https://proofwiki.org/wiki/Main_Page|ProofWiki 定理证明收集wiki]]
===== 问题 =====
  * [[.:funny formula]]
  * [[.:Coupon_collector_problem]]
  * [[.:Euler's formula]]
  * [[.:Tessellation]]
===== 子分类 =====
  * [[.:Number_Theory]]
  * [[.:Graph_Theory]]
  * [[.:statistics]]
  * [[.:Mathematical_Analysis]]
===== Tools =====
  * [[LaTeX]]

===== Fun =====
  * [[http://www.conwaylife.com/wiki/Conway's_Game_of_Life|Conway's Game of Life]]
    * [[http://mingplusplus.com/game-of-life/]]