David E Speyer's user avatar
David E Speyer's user avatar
David E Speyer's user avatar
David E Speyer
  • Member for 14 years, 5 months
  • Last seen this week
167 votes

Most memorable titles

128 votes
Accepted

Why do primes dislike dividing the sum of all the preceding primes?

109 votes
Accepted

Invertible matrices of natural numbers are permutations... why?

100 votes
Accepted

Irreducibility of polynomials in two variables

87 votes

$\prod_{n=1}^{\infty} n^{\mu(n)}=\frac{1}{4 \pi ^2}$

83 votes
Accepted

Why could Mertens not prove the prime number theorem?

76 votes

Conceptual reason why the sign of a permutation is well-defined?

72 votes

Applications of the Chinese remainder theorem

72 votes

Open problems with monetary rewards

70 votes

When is the product of two ideals equal to their intersection?

69 votes
Accepted

Generating a finite group from elements in each conjugacy class

69 votes
Accepted

Ideas for introducing Galois theory to advanced high school students

68 votes
Accepted

When can one continuously prescribe a unit vector orthogonal to a given orthonormal system?

65 votes

Strengthening the induction hypothesis

60 votes
Accepted

Computing $\prod_p(\frac{p^2-1}{p^2+1})$ without the zeta function?

58 votes

Applications of the Chinese remainder theorem

58 votes

English reference for a result of Kronecker?

57 votes

Eigenvalues of matrix sums

56 votes
Accepted

What is the Hirzebruch-Riemann-Roch formula for the flag variety of a Lie algebra?

56 votes

What should be learned in a first serious schemes course?

55 votes

Are there infinitely many integer-valued polynomials dominated by $1.9^n$ on all of $\mathbb{N}$?

52 votes
Accepted

How to visualize Dirichlet’s unit theorem?

51 votes

Does the rational power series ring $\mathbb{Q}[[X]]$ embed as a ring into the field of real numbers?

50 votes

What should be learned in a first serious schemes course?

45 votes

Are there infinitely many integer-valued polynomials dominated by $1.9^n$ on all of $\mathbb{N}$?

44 votes
Accepted

Tell me an algebraic integer that isn't an eigenvalue of the sum of two permutations

43 votes
Accepted

(Short) Exact sequences with no commutative diagram between them

43 votes

How did Cole factor $2^{67}-1$ in 1903?

43 votes

What should be offered in undergraduate mathematics that's currently not (or isn't usually)?

43 votes
Accepted

Is no proof based on "tertium non datur" sufficient any more after Gödel?

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