# 2-Sylow subgroup of special linear group:SL(2,5)

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This article is about a particular subgroup in a group, up to equivalence of subgroups (i.e., an isomorphism of groups that induces the corresponding isomorphism of subgroups). The subgroup is (up to isomorphism) quaternion group and the group is (up to isomorphism) special linear group:SL(2,5) (see subgroup structure of special linear group:SL(2,5)).
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$G$ is the special linear group:SL(2,5), i.e., the special linear group of degree two over field:F5. In other words, it is the group of invertible $2 \times 2$ matrices of determinant 1 over the field with three elements. The field has elements 0,1,2,3,4 with $4 = -1$.

$H$ is the subgroup:

$\{ \begin{pmatrix} 1 & 0 \\ 0 & 1 \\\end{pmatrix}, \begin{pmatrix} 4 & 0 \\ 0 & 4 \\\end{pmatrix}, \begin{pmatrix} 0 & 4 \\ 1 & 0 \\\end{pmatrix}, \begin{pmatrix} 0 & 1 \\ 4 & 0 \\\end{pmatrix}, \begin{pmatrix} 4 & 4 \\ 4 & 1 \\\end{pmatrix}, \begin{pmatrix} 1 & 1 \\ 1 & 4 \\\end{pmatrix}, \begin{pmatrix} 1 & 4 \\ 4 & 4 \\\end{pmatrix}, \begin{pmatrix} 4 & 1 \\ 1 & 1 \\\end{pmatrix} \}$