# Problemania

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bio website problemania.org location Problemania age member for 1 year, 7 months seen 5 hours ago profile views 9

A moderator at Wiki site http://problemania.org where a group of enthusiasts enjoying sharing the fun solving mathematics, physics, and computing problems. We primarily work on problems found in college/grad school text books.

Web page: http://problemania.org

# 19 Actions

 5h accepted Intuition for “the existence of a basis for every vector space is equivalent to the Axiom of Choice”? 6h comment Intuition for “the existence of a basis for every vector space is equivalent to the Axiom of Choice”? @Stella, I understand what AC is, and of course what vector space and its basis is, but it's hard to see the said equivalence or even start to appreciate it after being told so. 6h asked Intuition for “the existence of a basis for every vector space is equivalent to the Axiom of Choice”? Sep10 asked Why Euler-Lagrange equation does not depend on the second derivative of the function? Apr6 comment The last few digits of $0^0$ are $\ldots0000000001$ (according to WolframAlpha). Could you give some reference on "$0^0$ is the number of functions from the empty set to the empty set"? I'm not familiar with this. Thanks! Jan26 asked What is the mathematics of UML? Jan25 accepted What algebraic structure is the set of natural numbers and addition? Jan23 comment What algebraic structure is the set of natural numbers and addition? Could someone recommend a listing of abstract algebraic structures with its features and examples? I have the feeling someone must have tabulated that. Jan23 comment What algebraic structure is the set of natural numbers and addition? What if 0 is excluded? Jan23 asked What algebraic structure is the set of natural numbers and addition? Dec15 awarded Supporter Dec15 revised How random is the digits of $\pi$? added 6 characters in body Dec15 awarded Editor Dec15 revised How random is the digits of $\pi$? added 221 characters in body Dec15 asked How random is the digits of $\pi$? Aug18 awarded Scholar Aug18 accepted What's the analogue of Sierpinski triangle to disk? Jul25 awarded Student Jul25 asked What's the analogue of Sierpinski triangle to disk?