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Higher Order Differential Calculus in Mathlib
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DOI：10.1145/3779031.3779102.png)
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Abstract
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We report on the higher-order differential calculus library developed inside the Lean mathematical library Mathlib. To support a broad range of applications, we depart in several ways from standard textbook definitions: we allow arbitrary fields of scalars, we work with functions defined on domains rather than full spaces, and we integrate analytic functions in the broader scale of smooth functions. These generalizations introduce significant challenges, whichwe address from both the mathematical and the formalization perspectives.
Keywords:
Formalization
Lean
Mathlib
differential calculus
smoothness classes
analytic functions
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