Mathematical Sciences Classification System
39Axx - Difference equations 
{For dynamical systems, see  37-XX; for dynamic equations on time scales, see  34N05}
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                            39A05General theory
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                            39A06Linear equations
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                            39A10Difference equations, additive
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                            39A11Stability and asymptotics of difference equations; oscillatory and periodic solutions, etc.
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                            39A12Discrete version of topics in analysis
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                            39A13Difference equations, scaling ($q$-differences) [See also 33Dxx]
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                            39A14Partial difference equations
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                            39A20Multiplicative and other generalized difference equations, e.g. of Lyness type
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                            39A21Oscillation theory
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                            39A22Growth, boundedness, comparison of solutions
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                            39A23Periodic solutions
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                            39A24Almost periodic solutions
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                            39A28Bifurcation theory
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                            39A30Stability theory
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                            39A33Complex (chaotic) behavior of solutions
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                            39A45Equations in the complex domain
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                            39A50Stochastic difference equations
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                            39A60Applications
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                            39A70Difference operators [See also 47B39]
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                            39A99None of the above, but in this section