MathterRiddler on Horizon: "Puzzle from the Mathter website - Sets in the Plane: https://t.co/UXUBgr6Fng #P"

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MathterRiddler @MathterRiddler

Puzzle from the Mathter website - Sets in the Plane: mathter.islands.co.il/en/questions/5… #Puzzle #Circles #ConstructinganExampleCounterexample #SetTheory #ProofbyContradiction #MinimumandMaximumProblemsOptimizationProblems

5:00 PM · Jan 17, 2026 · 10 Views

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