Mathematical Sciences Classification System
70Fxx - Dynamics of a system of particles, including celestial mechanics
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                            70F05Two-body problems
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                            70F07Three-body problems
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                            70F10$n$-body problems
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                            70F15Celestial mechanics
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                            70F16Collisions in celestial mechanics, regularization
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                            70F17Inverse problems
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                            70F20Holonomic systems
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                            70F25Nonholonomic systems
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                            70F35Collision of rigid or pseudo-rigid bodies
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                            70F40Problems with friction
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                            70F45Infinite particle systems
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                            70F99None of the above, but in this section