A bad Cayley–Hamilton theorem proof
35155
To prove Cayley-Hamilton theorem, why can't we substitute $A$ for $\lambda$ in $p(\lambda) = \det(\lambda I - A)$?
7164
Proof of Darboux's theorem
44747
Finding the effective Hamiltonian in a certain subspace
20407
Proof of Wolstenholme's theorem
23520
A property of Littlewood-Paley decomposition
56828
A combinatorial proof that the alternating sum of binomial coefficients is zero
8920
There exists $C\neq0$ with $CA=BC$ iff $A$ and $B$ have a common eigenvalue
65700
Deriving Birkhoff's Theorem
121271
Stirling's Approximation Proof
88442
Prove that there's no ordered basis $E$ in which $T{x\choose y}={0\choose y}$ can be represented as $1\ 2\choose 2\ 4$
83778
An incorrect proof by exhaustion
64075
Prove that a set of connectives is inadequate
16172
My proof of $I \otimes N \cong IN$ is clearly wrong, but where have I gone wrong?
49439
Matrix exponential via Cayley-Hamilton Theorem
31252
"Efficient version" of Cayley's Theorem in Group Theory
77633
Can someone explain Cayley's Theorem step by step?
42265
A proof that $\displaystyle\sum_{i=1}^{n}P''(r_i)/P'(r_i)=0$ for a degree $n$ polynomial