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45
Why/How does the determinant of the Hessian matrix, combined with the 2nd derivatives, tell us max., min., saddle points? Reasoning behind it?
Oct 26, 2016
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22
Are there any objects which aren't sets?
Mar 22, 2016
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20
Calculus and Category theory
Apr 11, 2017
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18
"Proper" definition of a proper map?
Apr 6, 2017
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16
Properties of the category of smooth vector bundles over a smooth manifold
Apr 30, 2015
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16
Is there an infinite dimensional Lie group associated to the Lie algebra of all vector fields on a manifold?
May 17, 2015
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15
Motivation for the definition of an infinitesimal object
Apr 2, 2015
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15
What does prolongation mean in differential geometry?
Feb 26, 2017
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15
Basic Geometric intuition, context is undergraduate mathematics
Nov 10, 2016
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What is the gentlest notes/book of intro differential topology?
Jun 29, 2017
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Are the tags "projective-spaces" and "projective-geometry" synonyms?
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Synthetic vs. classical differential geometry
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Constructive algebraic geometry
29
Etiquette of publishing folklore results
27
Examples of Kan extensions, adjunctions, and (co)monads in analysis, Lie theory, and differential geometry?
25
Is there a useful theory of D-modules on smooth (non-analytic) manifolds?