Joppy's user avatar
Joppy's user avatar
Joppy's user avatar
Joppy
  • Member for 7 years
  • Last seen this week
53 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?

24 votes
Accepted

Simultaneous Diagonalizability of Multiple Commuting Matrices

19 votes
Accepted

Primality testing for 64 bit numbers

17 votes

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

16 votes
Accepted

Direct product vs direct sum of infinite dimensional vector spaces?

12 votes
Accepted

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

12 votes
Accepted

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

11 votes
Accepted

Number of elements in polynomial of degree n and m variables

11 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

9 votes
Accepted

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

8 votes

What does $x^TAx$?

8 votes
Accepted

Invariant Polynomials under Rotations

8 votes
Accepted

Exterior power of lie algebra representation in coordinates

7 votes
Accepted

Hopf monoids in different categories

7 votes
Accepted

Schur-Weyl duality for qubits

7 votes
Accepted

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

6 votes
Accepted

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

6 votes

Prove the limit of $\cos(1/x)$ does not exist as $x \to 0$, by using Epsilon and Delta.

6 votes
Accepted

Short way for upper triangularization

6 votes
Accepted

Why is the opposite Borel subgroup used?

6 votes
Accepted

Logarithm of $I_n-N$ for $N$ nilpotent

6 votes
Accepted

Integral using group theory

6 votes
Accepted

Exterior powers of tensor products

5 votes
Accepted

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

5 votes
Accepted

"Zero set of finitely many polynomials." but what polynomials are we talking about?

5 votes
Accepted

The action of the longest element on weights

5 votes

When is the orbit of a vector spanning the whole space?

1
2 3 4 5
13