Characterization of integral quadratic forms representing the same numbers?
132125
finding if two binary quadratic forms represent the same integers
136933
Which $n$ can be expressed as $x^2 − y^2$?
76959
Uses of quadratic reciprocity theorem
129163
Showing that every positive integer can be represented in this form
132672
Are $\log_1 1$ and $\log_0 0$ indeterminate forms?
20486
Numbers representable as $x^2 + 2y^2$
33396
Generalizing a Trig Identity
54628
Properties of non-zero symmetric bilinear form
63587
Possible Jordan Canonical Forms Given Minimal Polynomial
139162
Complex number isomorphic to certain $2\times 2$ matrices?
97204
Is there a unique solution for this quadratic matrix equation?
5287
Representing every positive rational number in the form of $(a^n+b^n)/(c^n+d^n)$
994
Linear independence of vectors that form non-square matrix
107992
Bilinear form with symmetric "perpendicular" relation is either symmetric or skew-symmetric
95335
diagonalize quadratic form
35874
Show that when $BA = I$, the solution of $Ax=b$ is unique
19280
Jordan Canonical Form determined by characteristic and minimal polynomials in dimension $3$, but not beyond