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Everything about Smoothness

Degree of differentiability of a function or map

In calculus and mathematical analysis, the smoothness of a function describes the number of times it can be differentiated without producing discontinuities. The smoothness, or differentiability class, is an integer such that a function has all derivatives up to order, and such that all of these derivatives are continuous. One says that such a function has class. For example, the absolute value function has class, because it is continuous, but not differentiable. Generally, the term smooth function refers to a -function, that is a function having derivatives of all orders. However, it may also mean "sufficiently differentiable" for the problem under consideration. Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: SmoothnessA 5-minute orientation
  2. Skim a recent paper: Guaranteed Tensor Recovery Fused Low-rankness and SmoothnessInfluential work since 2022
  3. Pick up a classic book: Muscarinic receptor subtypes in smooth muscleThe most-reprinted book on the subject
  4. Read the landmark paper: Adapting to Unknown Smoothness via Wavelet ShrinkageCited 3,429 times
  5. Go sideways: Differentiable vector-valued functions from Euclidean spaceA closely related topic
  6. Go sideways: Sobolev spaceA closely related topic

📖 Definitions

Noun The condition of being smooth; the degree or measure of said condition.

Noun The highest order of derivative (the differentiability class) over a given domain.

Noun The quantity measured by the modulus of smoothness.

🏆 Landmark papers (most cited)

🆕 Influential since 2022

📚 Books worth reading

Ranked by number of editions on Open Library, a rough measure of how lasting a book is.

🔗 Related topics