206

Answers
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74
solving f(f(x))=g(x)
30
How to solve f(f(x)) = cos(x) ?
12
What is the definition of “canonical” ?
5
What is torsion in differential geometry intuitively?
7
The Ramanujan Problems.
14
Why is Lebesgue integration taught using positive and negative parts of functions?
41
Is there a dense subset of the real plane with all pairwise distances rational?
25
Linearity of the inner product using the parallelogram law
65
Is the sphere the only surface all of whose projections are circles? Or: Can we deduce a spherical Earth by observing that its shadows on the Moon are always circular?
5
Is every finite group a group of “symmetries”?
10
Positive solutions of linear Diophantine equations
26
Why are free groups residually finite?
9
Publishing journals articles without transferring copyright.
12
Covering a circle with red and blue arcs
18
Set theory in practice
9
Why should I prefer bundles to (surjective) submersions?
13
Why can’t the Klein bottle embed in $\mathbb{R}^3$?
5
Nice proof of the triangle inequality for the metric of the hyperbolic plane
22
An easy proof that S(n) does not embed into A(n+1)?
4
Determinant of a metric?
5
Generating n-cycles
18
Smoothness of distance function in Riemannian Manifolds
11
Polynomial positive on an interval
4
Determine if circle is covered by some set of other circles
9
How to construct a topological conjugacy?
8
Uniqueness in Composition of Polynomials
7
Details of Perelman’s example about soul of Alexandrov space
22
Smooth functions for which $f(x)$ is rational if and only if $x$ is rational
24
When factors may be cancelled in homeomorphic products?
6
What’s wrong with compact-open topology on the space of maps?
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