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Brian's user avatar
Brian's user avatar
Brian
  • Member for 6 years, 6 months
  • Last seen more than 1 year ago
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I'm an amateur in mathematics.

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Intersection of nested open ball in complete metric spaces is nonempty?
Sep 28, 2018
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Covering a circle with small balls centered at nodes on a tiling
Sep 25, 2017
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Given $BA+B^2=I-BA^{2}$ what can be said about the matrices A, B?
8
How to prove $\sum_{i=1}^ki^k(-1)^{k-i}\binom {k+1}{i} =(k+1)^k$