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The concept of a **subderivative** arises in the context of convex analysis and nonsmooth analysis. It generalizes the idea of a derivative to non-differentiable functions. Here’s a brief overview of its key aspects: 1. **Context**: In classical calculus, the derivative of a function at a point measures the rate at which the function changes at that point.

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  1. Variational analysis
  2. Control theory
  3. Applied mathematics
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