More algebra fun

I recently posted on algebraic rules for rewriting linear and quadratic forms and showed how Kronecker products come into play when expanding products of matrices. Likewise, we might come into a situation where parameters of interest are inside a Kronecker product which we want to “pull out”. As the operation is still linear this should […]

Fun with algebra

Quite often, the key to finding an efficient solution to a given problem is to rewrite it in simpler terms. This requires a fair amount of experience and a good toolbox of rules one can apply to transform things. For me, problems are often algebraic and I have to deal with products of (tensors,) matrices […]

Mathjax test

Sometimes, my blog posts my contain formulas. This could be simple inline formulas like $e^{j \pi} + 1 = 0$ or longer ones line $\int_{-\infty}^\infty e^{-x^2} {\rm d}x = \sqrt{\pi}$. It could also be displayed equations like $$\sum_{n=0}^\infty q^n = \frac{1}{1-q}, \quad q \in \real, |q| < 1.$$ And, in particular they might involve vectors […]


So, here it is. I give the world a gift it has not been waiting for: Adding yet another blog to the endless list of millions of blogs with totally infrequent updates and no coherent content. Why am I doing that? Well, from time to time, there are small things, I find neat and I […]