## Tagged Questions

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### Heisenberg Lie algebras

Dear forum, I would like to ask if $H(m)$ is the Heisenberg Lie algebra of dimension $2m+1$ and $M$ is an ideal of $H(m)$. Can we say that $M$ has a complement in $H(m)$?
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### Real root of a cubic equation

I have a function f(x,n) can be expressed as a cubic function of x with coefficients that are functions of n. For example x^3 + (n-2)x^2 + (3n-6)x + n. I want to prove that for e …
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### Bounds on the crossing numbers of de Bruijn graphs and some incidence graphs

Hi there, My question today is related to bounds for the crossing number $cr$ of the $k$-dimensional de Bruijn graph $B(t,k)$ on $t$ symbols (http://en.wikipedia.org/wiki/De_Bruij …
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### Joint distribution from multiple marginals

Consider an experiment consisting of a repeated trial with two random Bernoulli (=binary) variables, A and B. Each trial consists of multiple outcomes for both A and B. Each trial …

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