Problem solving Knapsack problem No Problem Mathematical problem Fleet problem Decision problem Problem of evil Optimization problem Candle problem Travelling salesman problem Hamiltonian path problem XY problem Kepler problem Cutting stock problem Büchi's problem Problem (disambiguation) Three-body problem Missionaries and cannibals problem Weber problem Computational problem Belt problem Behrens–Fisher problem Halting problem N-body problem Post correspondence problem Wicked problem Undecidable problem Predecessor problem Sleeping barber problem Kirkman's schoolgirl problem Jeep problem Hard problem of consciousness Shorte…

est path problem Assignment problem Millennium Prize Problems Two Generals' Problem Napkin folding problem Open problem Funarg problem Clique problem Znám's problem Dining philosophers problem Economic problem Somebody else's problem Trolley problem Problem statement Year 2011 problem Problem child Maximum flow problem Covering problems Problem of Hell Waring's problem Constant problem Lattice problem Creative problem-solving Cauchy problem Minimum-cost flow problem Hierarchy problem Flatness problem Continuous knapsack problem Problem of Apollonius Cigarette smokers proble

m Hundred Fowls Problem Newton–Pepys problem Coin problem Problem of induction Oberwolfach problem Plateau's problem Activity selection problem Archimedes's cattle problem Vehicle routing problem Hilbert's problems P versus NP problem Partition problem Social problem-solving Word problem Hilbert's tenth problem Gauss circle problem Fagnano's problem Dirichlet problem Yao's Millionaires' problem Canadian traveller problem Numerical sign problem Problem management Problem frames approach Napoleon's problem Symbol grounding problem Chinese postman problem Waring–Goldbach problem Three prisoners problem Sleeping