# Changes

## Subgroup structure of dihedral group:D8

, 16:25, 22 June 2011
no edit summary
$a = (1,2,3,4), \qquad x = (1,3)$.
==Graphical descriptionTables for quick information== ===Lattice of all subgroups=== [[File:D8latticeofsubgroups.png|300px]]
===Lattice of normal subgroups=== [[File:D8latticeofnormalsubgroupsD8latticeofsubgroups.png|1000px500px]] The lattice of normal subgroups fits into the following general picture, which is the general picture of the lattice of normal subgroups for [[groups having the same Hall-Senior genus]] as this (namely, this and the [[quaternion group]]). The Hall-Senior genus is $8\Gamma_2a$. [[File:8Gamma2a.png|1000px]]==Tables for quick information==
===Table classifying subgroups up to automorphisms===