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Captain Lama
  • Member for 6 years, 2 months
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70 votes
Accepted

Can you make a sphere out of a plane?

44 votes
Accepted

What is a virtual point of a metric space?

24 votes
Accepted

Explaining Newton Polygon for proving irreducibility of polynomial in $\mathbb{Z}[x]$ in elementary way

20 votes

I don't understand what a "free group" is!

19 votes

Non-geometric Proof of Pythagorean Theorem

17 votes

How do we know if two objects in a category are the same or not?

17 votes

How many ways are there to prove Cayley-Hamilton Theorem?

17 votes
Accepted

Are the components of the unit of an adjunction monomorphisms?

16 votes

Why is the Axiom of Pairing required?

16 votes
Accepted

What's the automorphism group of the real and complex numbers and the quaternions?

14 votes

The concept of net and subnet in topology

12 votes
Accepted

Non-monadic adjunction

12 votes
Accepted

Why does it have to be an integer?

11 votes
Accepted

Krull Topology on Galois Groups (two equivalent(?) definitions).

10 votes
Accepted

A space is contractible if and only if its identity map is nullhomotopic

10 votes
Accepted

Sum of three perfect cubes is equal to a perfect fourth

9 votes
Accepted

Why are we interested in cohomology?

9 votes
Accepted

Abelianization of free product is the direct sum of abelianizations

9 votes
Accepted

Isomorphic subfields of $\mathbb C$

8 votes
Accepted

Are isomorphisms stable under pullbacks?

8 votes

Are $\mathbb{R}$ and $\mathbb{R}^n$ isomorphic for $n > 1$?

8 votes

How to prove that field of rational functions is a *proper* subset of field of formal Laurent series?

8 votes
Accepted

Morita equivalence between $\mathbb{C}[G]$ and $\mathbb{C}[H]$?

8 votes

Every group of order $n$ with $p|n$ have a sub group of index $p$

8 votes
Accepted

Ramified primes, as defined by Neukirch

8 votes

Motivation of Stone–Čech compactification

7 votes
Accepted

Is there always a non-cyclic abelian subgroup of S2n with order n^2?

7 votes
Accepted

Class of rings between fields and euclidean domains (improvement of euclideanity)

7 votes

Is $\mathbb{Z}$ contained in $\mathbb{Z}_p$?

7 votes
Accepted

Irreducibility of polynomials in $\mathbf{Z}_p[x]$ - understanding proofs

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