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Adrian Clough's user avatar
Adrian Clough's user avatar
Adrian Clough's user avatar
Adrian Clough
  • Member for 8 years, 4 months
  • Last seen more than a month ago
8 votes
1 answer
370 views

Is a non-separable algebraic field extension $k \subset E$ normal if $\mathrm{Aut}_{E}(\bar{k})$ is a normal subgroup of $\mathrm{Aut}_{k}(\bar{k})$?

8 votes
3 answers
2k views

Distinguishing field extensions of $\mathbb{Q}$ of degree $3$.

5 votes
1 answer
401 views

example of a subset of a smooth manifold admitting a unique smooth structure making the inclusion an immersion, which is not a weak embedding.

4 votes
2 answers
450 views

Reference request: Inclusion of smooth maps into continuous maps between smooth manifolds is a weak homotopy equivalence.

3 votes
1 answer
564 views

Obtaining higher order terms of the Baker-Campbell-Hausdorff formula as higher order commutators

3 votes
1 answer
153 views

Lemma B.1.3.2 in Johnstone's Sketches of an Elephant

1 vote
0 answers
138 views

Examples of weakly dualizable objects in a non-closed monoidal category.

1 vote
0 answers
222 views

When is a fibration (canonically) a principal fibration over its group of automorphisms?

1 vote
2 answers
236 views

Does the forgetful functor from smooth manifolds to sets preserve colimits?