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Joppy
  • Member for 5 years, 4 months
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42 votes
Accepted

Determinant of large matrices: there's GOTTA be a faster way

25 votes
Accepted

How does calculus without Euler's number (e) look?

18 votes
Accepted

Simultaneous Diagonalizability of Multiple Commuting Matrices

17 votes

What are some mathematical topics that involve adding and multiplying pictures?

16 votes
Accepted

Primality testing for 64 bit numbers

15 votes
Accepted

Direct product vs direct sum of infinite dimensional vector spaces?

10 votes

Why does the discriminant in the Quadratic Formula reveal the number of real solutions?

10 votes

Optimization explained to a middle school kid

10 votes
Accepted

direct sum of representation of product groups

10 votes
Accepted

Why should we expect Maschke's theorem to be true?

8 votes
Accepted

Why exactly limit in polar coordinates isn't sufficient to find the limit in two variables?

7 votes
Accepted

Invariant Polynomials under Rotations

7 votes
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Hopf monoids in different categories

7 votes
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Number of elements in polynomial of degree n and m variables

7 votes
Accepted

Function that is onto, but not one-to-one.

6 votes
Accepted

What is a "standard representation" of a symmetric group?

6 votes
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Why is the opposite Borel subgroup used?

6 votes
Accepted

Integral using group theory

6 votes
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Is there a name for this construction? (group acting on vector bundle)

5 votes
Accepted

Computing an expression involving characters

5 votes
Accepted

$\dim V_\lambda=\dim V_{w(\lambda)}$ when $V$ is an integrable module over a Kac-Moody algebra

5 votes

What's the best way to think about the Hessian?

5 votes
Accepted

Short way for upper triangularization

5 votes

What does $x^TAx$?

5 votes
Accepted

Maximum number of irreducible representation of finite group

5 votes
Accepted

Schur-Weyl duality for qubits

5 votes
Accepted

Is there an analog of highest weight theory for finite groups?

5 votes
Accepted

Embedding the exterior algebra into the tensor algebra

5 votes
Accepted

Can any highest weight module in $\mathcal{O}$ be constructed from a Verma module?

5 votes

Why do we consider actions on vector spaces but not finite sets when doing representations of finite groups?

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