Elections in which every Condorcet winning set has four candidates
Construct an election in which every Condorcet winning set has at least four candidates, refuting the conjecture that three always suffice.
Issue
疑问、子问题和求助。把大问题拆成子 Issue;从任何一个 Issue 都能开出路线。
没有开放的 Issue
Issue 用来放疑问、子问题和求助。