As part of an heat exchanger problem, we are given two unknowns $T_{cs}$ and $T_{fs}$ solving the following equations: $\forall (Q,U,F, m_c,m_f, C_c,C_f, \Sigma , T_{ce},T_{fe}) \in \mathbb{R_+^*}^{10}, Q = U \Sigma F \frac{T_{ce}-T_{fs} -T_{cs} +T_{fe}}{ln(\frac{T_{ce}-T_{fe}}{T_{cs}-T_{fs}})} =...
A problem I'm currently considering requires me to generate (pseudo-)random Gaussian integer matrices with Gaussian integer matrix inverses. By analogy with an algorithm I know for generating random orthogonal matrices, I considered an algorithm where a random Gaussian integer matrix whose real a...
Does anyone know an approach to finding the Hermite Normal Form for smaller matrices, like $ A =\begin{pmatrix} 6 & -6 & 9\\ 3 &2 & 2 \end{pmatrix} $ Or does one just have to shuffle around more or less randomly?
Apparently we have tags cohomology-operations and cohomological-operations, with 10 and 20 questions respectively (including 1 with both), different tag excerpts, and a tag wiki for the first one only. I don't know the topic very well, but the excerpts seem to describe essentially the same contex...
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