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Versuch einer Classification der willkürlichen Functionen reeller Argumente nach ihren Aenderungen in den kleinsten Intervallen

Weierstrass, K. (1872). Versuch einer Classification der willkürlichen Functionen reeller Argumente nach ihren Aenderungen in den kleinsten Intervallen. Journal für die reine und angewandte Mathematik.

Type
Journal article
Intellectual base
Primary research
Year
1872
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mathematics

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    • and Weierstrass (1872)

      This sourceThe construction of a continuous nowhere-differentiable function (`W(x) = Σ aⁿ cos(bⁿπx)` for suitable `a, b`), presented in his Berlin lectures; published in Du Bois-Reymond, P. (1875), "Versuch einer Classification der willkürlichen Functionen reeller Argumente nach ihren Aenderungen in den kleinsten Intervallen," Journal für die reine und angewandte Mathematik, 79, 21–37. (Originating treatment of a continuous-everywhere / differentiable-nowhere function, decisively separating continuity from differentiability; also the source of the modern epsilon-delta formulation of continuity that became textbook standard.)

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