Given $G=\left\{A\in M_2(\mathbb{R})\mid A^\top XA = X\right\}$.
Need to find the basis. Error in question
lie-algebraslie-groups
asked 2011-12-31
user id:21873
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Treat $Y^TX+XY=0$ as a system of homogeneous equations in the unknown four entries $y_{ij}$ of the matrix $Y$. Use linear algebra techniques to find a basis for the solution space. I got a different basis (but a 1-dimensional space anyway). – 2011-12-31