Mathematics Educators
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s.harp
  • Member for 7 years, 1 month
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  • Germany
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Symmetrical equations are good in their place, but 'vector' is a useless survival, or offshoot from quaternions, and has never been of the slightest use to any creature.

Lord Kelvin in a letter to G.F. FitzGerald, 1896

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57
What knot is this?
40
Is this function nowhere analytic?
38
Function that is the sum of all of its derivatives
24
Is the convex hull of a compact set compact?
24
Show that an open linear map between normed spaces is surjective.

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