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Ages of three children puzzleTwo envelopes problemSquaring the circleProton radius puzzleCollatz conjectureLogic puzzleIrreducible polynomialTemperature paradoxProof of impossibilityJacobian conjectureAnt on a rubber ropeSingular perturbationBalanceAge of the captainCombination puzzleMathematical problemP versus np problemProblem of pointsMathematical chess problemCrossed ladders problemNo-three-in-line problemAristotle's wheel paradoxBasel problemRsa problemBalance puzzleInduction puzzlesGoldbach's conjecture3sumHodge conjectureSkolem's paradoxParameter identification problemInaccessible cardinalFermat's last theoremString girdling earthSquaring the squareSatisfiability modulo theoriesBlock-stacking problemBlack hole information paradoxSet cover problemIrreducible elementChess problemDiophantine equationCrocodile dilemmaTiling puzzleMonkey and banana problemPrimitive notionFredkin's paradoxGettier problemUncountable setLongest path problemDissection puzzleOpen problemTranscendental functionNon-monotonic logicMaximal independent setLongest common subsequence problemTwo capacitor paradoxJosephus problemCantor setCantor functionSmallest-circle problemPseudoprimeCircle packing in a circleDivergent seriesGoldbach's weak conjectureHausdorff paradoxNo-go theoremCannonball problemSperner's theoremAxiom of empty setSnake-in-the-boxPenrose triangleFermat primality testEmpty productTranscendental equationHorn-satisfiabilityRichard's paradoxCircle packing in a squareMu puzzleGauss circle problemPhase problemNon-perturbativeFunction problemProof by contradictionTranscendental numberAssignment problemMulti-armed banditSimple lie algebraImpossible objectComputational hardness assumptionInscribed square problemNewcomb's paradoxAllais paradoxSuslin's problemReverse mathematicsPartial permutationRectangle packingGraph isomorphism problemIndependenceComputational problem