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user251257
  • Member for 9 years, 5 months
  • Last seen more than 5 years ago
  • Germany
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Doing math for fun.

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13
Does positive definite Hessian imply the Jacobian is injective?
12
Is the Sinc function continuous?
11
why does the reduced row echelon form have the same null space as the original matrix?
10
How to show that the Dini Derivatives of a measurable function is measurable?
9
Is the minimum of a parametric convex function convex again?