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Real-valued functions of real variable, analytic properties of functions and sequences, limits, continuity, smoothness of these.

32 votes
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Is every real number in [0,1] a product of three (or more) Cantor set's numbers?

Yes, every real number $u \in [0,1]$ can be written as $u = x^2 y$ where $x,y \in C$ are in the Cantor set $C$. In particular, every real number in $[0,1]$ is a product of three Cantor set elements. T …
Zach Teitler's user avatar
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5 votes

Reference request: A multidimensional generalization of the fundamental theorem of calculus

The $p=2$ dimensional case is an exercise in Rogawski's calculus textbook. It is exercise 47 on page 885, section 15.1 (Integration in Several Variables) in the 2008 Early Transcendentals edition.
Zach Teitler's user avatar
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1 vote

About local maxima of multivariable polynomials

The set of critical points (in the domain) of a polynomial is the solution set of a system of polynomial equations viz the vanishing of the first derivatives. So it has finitely many irreducible compo …
Zach Teitler's user avatar
  • 6,237