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Triangles of area one in sets of large measure
Show that every planar set of large enough measure contains the vertices of a triangle of area 1; Erdős guessed area 4π/√27 suffices.
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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。
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Issue 用来放疑问、子问题和求助。