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# Questions

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10
10
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### A problem of an infinite number of balls and an urn [closed]

jul 9 10 at 18:54 Wolfgang Mueckenheim 1116

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### Nice proof of the triangle inequality for the metric of the hyperbolic plane

apr 16 10 at 19:30 Sergei Ivanov 22.3k4594

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### Why is the exterior differentiation operator sometimes visualized as the “boundary”?

apr 1 11 at 4:45 Feri 355

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### What is the term analogous to “Wronskian” for difference equations?

nov 18 10 at 15:50 Tyler Clark 1119

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### Proving the Gauss-Bonnet theorem for embedded surfaces using triangulations

mar 9 12 at 15:31 Liviu Nicolaescu 11.3k12033

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### Generalized trigonometric functions \$Cos(n) v\$ and \$Sin(n) v\$.

dec 19 11 at 7:34 J. M. 2,115720

0
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246
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### Identifying a sequence of polynomials

oct 23 10 at 18:30 Ben Webster 20.7k144114

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### What is the space of variations for variable endpoints problems?

apr 18 11 at 11:46 Jean-Philippe Burelle 483211

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