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• 27 Why/How does the determinant of the Hessian matrix, combined with the 2nd derivatives, tell us max., min., saddle points? Reasoning behind it?
• 23 Are there any objects which aren't sets?
• 18 Redefine \emph to be both bold and italic
• 16 Calculus and Category theory
• 15 Basic Geometric intuition, context is undergraduate mathematics
• 14 Properties of the category of smooth vector bundles over a smooth manifold
• 13 Is the intersection connected if union is simply connected?
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