Evolution of Differentiability and Non-Smooth Optimization
Which of the following best describes how the concept of differentiability evolved following the development of non-smooth optimization techniques in the late 20th century?
A
It has become more restrictive, focusing only on infinitely differentiable functions
B
It has been replaced entirely by discrete approximation methods
C
It has shifted towards emphasizing only directional derivatives in multivariable calculus
D
It has expanded to include generalized notions of derivatives for non-smooth functions
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