292

Answers

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54

Why were matrix determinants once such a big deal?

46

Mathematical “urban legends” (2)

44

Not especially famous, long-open problems which anyone can understand

30

Why are matrices ubiquitous but hypermatrices rare?

28

Is square of Delta function defined somewhere?

24

Examples of common false beliefs in mathematics. (3)

24

How often do people read the work that they cite?

23

Old books still used

21

how to find/define eigenvectors as a continuous function of matrix?

19

German mathematical terms like “Nullstellensatz”

18

Awfully sophisticated proof for simple facts

18

Where is number theory used in the rest of mathematics? (2)

15

Fiction books about mathematicians? (3)

15

2D Problems Which are Easier to Solve in 3D

15

Generalized notions of solutions in various areas of mathematics

15

Theorems that are ‘obvious’ but hard to prove

14

Self-dual normed spaces which are not Hilbert spaces

13

Eigenvectors and eigenvalues of Tridiagonal matrix

13

Is the Mendeleev table explained in quantum mechanics?

13

Eigenvalues of non-symmetric matrix and its transpose

13

Is the boundary $\partial S$ analogous to a derivative?

13

Why do we teach calculus students the derivative as a limit?

12

How does one motivates the method of separation of variables when teaching PDE’s?

12

What would you want to see at the Museum of Mathematics?

12

Does any research mathematics involve solving functional equations?

11

Surprising and Useful Physical Intuition for Mathematical Objects (2)

11

Solve in positive integers $n!=m(m+1)$

11

eigenfunction of heat operator.

10

Convergence of solutions to Navier-Stokes to Euler’s equation for viscosity $\to$ zero

10

Inverse of a totally unimodular matrix