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13 votes
1 answer
413 views

Maps from $D^n$ to $D^n$ with a single inverse set are open.

10 votes
1 answer
9k views

Prove $f=x^p-a$ either irreducible or has a root. (arbitrary characteristic) (without using the field norm) [duplicate]

9 votes
1 answer
3k views

Operator norm of a convolution

6 votes
2 answers
618 views

Are there odd-sheeted coverings of non-orientable surfaces by orientable surfaces?

5 votes
0 answers
108 views

Are these "Stiefel-Whitney numbers" invariants of the (smooth)topology of the total space?

4 votes
3 answers
678 views

Is such a map always null-homotopic?

4 votes
0 answers
199 views

A(nother ignorant) question on phantom maps

3 votes
1 answer
350 views

Subgroup complement for normal subgroup of $G$ with trivial center and $\mathrm{Aut}(N)=\mathrm{Inn}(N)$

2 votes
1 answer
1k views

Self-indexing Morse function on a torus which is a height function

2 votes
2 answers
46 views

Is the sum of a dense map and a nowhere dense map dense?

1 vote
0 answers
216 views

English translation of Kepler's "Nova stereometria doliorum vinariorum"

1 vote
1 answer
131 views

u-substitution integral $\int \frac{e^{-x^2}}{2x}dx$

1 vote
2 answers
53 views

Are topologically well-behaved measure 0 subsets of $\Bbb R^2$ finite graphs?