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This is the current revision of this page, as edited by DoctorKubla (talk | contribs) at 08:01, 7 July 2013. The present address (URL) is a permanent link to this version.

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Unsolved problems in biology
Part of a series on
Anatomy
Arthropod head problem
Ecology
Paradox of the plankton
Evolutionary biology
Origin of life Evolution of sexual reproduction
Gerontology
Biological aging
Paleontology
Cambrian explosion
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Unsolved problems in chemistry
Part of a series on
Organic chemistry
Alpha effect On water reaction
Biochemistry
Homochirality
Physical chemistry
Extent of the periodic table Mpemba effect Room-temperature superconductor Water cluster
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Unsolved problems in computer science
Part of a series on
Computational complexity theory
P = NP problem Unique games conjecture Exponential time hypothesis 3SUM
Algorithms
Graph isomorphism problem K-server problem
Programming language theory
POPLmark challenge Barendregt–Geuvers–Klop conjecture
Other problems
Aanderaa–Karp–Rosenberg conjecture Generalized star height problem
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Unsolved problems in economics
Part of a series on
Financial economics
Dividend puzzle Equity premium puzzle
International economics
Backus–Kehoe–Kydland puzzle Equity home bias puzzle Feldstein–Horioka puzzle Home bias in trade puzzle Real exchange-rate puzzles
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Unsolved problems in mathematics
Part of a series on
Additive number theory Collatz conjecture Diophantine quintuple Erdős conjecture on arithmetic progressions Erdős–Turán conjecture on additive bases Gilbreath's conjecture Goldbach's conjecture Pollock octahedral numbers conjecture
Algebra Hadamard conjecture Hilbert's sixteenth problem Perfect cuboid
Algebraic geometry André–Oort conjecture Bass conjecture Fröberg conjecture Fujita conjecture Hodge conjecture Jacobian conjecture Nakai conjecture n! conjecture Resolution of singularities in characteristic p Standard conjectures on algebraic cycles Section conjecture Virasoro conjecture Witten conjecture
Algebraic number theory Brumer–Stark conjecture
Analysis Khabibullin's conjecture on integral inequalities Lehmer's conjecture Pompeiu problem Schanuel's conjecture
Combinatorics 1/3–2/3 conjecture Conway's thrackle conjecture Hadwiger conjecture Lonely runner conjecture Singmaster's conjecture Union-closed sets conjecture
Graph theory Barnette's conjecture cycle double cover conjecture Erdős–Faber–Lovász conjecture Erdős–Gyárfás conjecture Hadwiger conjecture Hadwiger–Nelson problem New digraph reconstruction conjecture Reconstruction conjecture Ringel-Kotzig conjecture
Group theory Burnside's problem Inverse Galois problem
Number theory General abc conjecture Birch and Swinnerton-Dyer conjecture Brocard's problem Congruent number problem Lehmer's totient problem Littlewood conjecture Lychrel number Odd perfect number Quasiperfect number Prime numbers Catalan–Mersenne number conjecture Gaussian moat Landau's problems Lenstra–Pomerance–Wagstaff conjecture Polignac's conjecture Sierpinski problem Twin prime conjecture Wall–Sun–Sun prime
Set theory Ω-conjecture Singular cardinals hypothesis
Statistics Behrens–Fisher problem Multiple comparisons Sunrise problem Two envelopes problem
Other problems Baum–Connes conjecture Dixmier conjecture Inscribed square problem Invariant subspace problem Navier–Stokes existence and smoothness Problems in Latin squares Problems in loop theory and quasigroup theory Riemann hypothesis Yang–Mills existence and mass gap
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Unsolved problems in philosophy
Part of a series on
Epistemology
Gettier problem Molyneux's problem
Ethics
Problem of moral luck
Philosophy of language
Moore's paradox
Metaphysics
Sorites paradox
Philosophy of mind
Hard problem of consciousness Mind–body problem
Philosophy of science
Demarcation problem Problem of induction
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Unsolved problems in physics
Part of a series on
Astronomy Coronal heating problem Flyby anomaly Galaxy rotation problem Formation of supermassive black holes Relativistic jets Space roar Ultra-high-energy cosmic ray
Cosmology Baryon asymmetry Cosmic inflation Cosmological constant problem Dark energy Dark flow Dark matter Ecliptic alignment of cosmic microwave background anisotropy Horizon problem Shape of the Universe Ultimate fate of the universe
Particle physics Hierarchy problem Magnetic monopole Neutrino mass Physics beyond the Standard Model Proton spin crisis Strong CP problem
Quantum gravity Black hole information paradox Chronology protection conjecture Cosmic censorship hypothesis Hawking radiation Quantum gravity Vacuum catastrophe
Other problems Axon guidance Dimensionless physical constant Island of stability Mechanism of sonoluminescence
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