Mathematical Sciences Classification System
11Dxx - Diophantine equations 
[See also  11Gxx,  14Gxx]
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                            11D04Linear equations
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                            11D07The Frobenius problem
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                            11D09Quadratic and bilinear equations
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                            11D25Cubic and quartic equations
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                            11D41Higher degree equations; Fermat's equation
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                            11D45Counting solutions of Diophantine equations
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                            11D57Multiplicative and norm form equations
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                            11D59Thue-Mahler equations
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                            11D61Exponential equations
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                            11D68Rational numbers as sums of fractions
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                            11D72Equations in many variables [See also 11P55]
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                            11D75Diophantine inequalities [See also 11J25]
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                            11D79Congruences in many variables
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                            11D85Representation problems [See also 11P55]
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                            11D88$p$-adic and power series fields
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                            11D99None of the above, but in this section