# Direct product of A4 and D8

From Groupprops

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## Contents

## Definition

This group is defined as the external direct product of alternating group:A4 and dihedral group:D8.

## Arithmetic functions

Want to compare and contrast arithmetic function values with other groups of the same order? Check out groups of order 96#Arithmetic functions

Function | Value | Similar groups | Explanation |
---|---|---|---|

order (number of elements, equivalently, cardinality or size of underlying set) | 96 | groups with same order | order of direct product is product of orders: the order is thus where is the order of alternating group:A4 and is the order of dihedral group:D8. |

exponent of a group | 12 | groups with same order and exponent of a group | groups with same exponent of a group | exponent of direct product is lcm of exponents: we get . |

derived length | 2 | groups with same order and derived length | groups with same derived length | derived length of direct product is maximum of derived lengths: we get . |

minimum size of generating set | 2 | groups with same order and minimum size of generating set | groups with same minimum size of generating set |

## GAP implementation

### Group ID

This finite group has order 96 and has ID 197 among the groups of order 96 in GAP's SmallGroup library. For context, there are 231 groups of order 96. It can thus be defined using GAP's SmallGroup function as:

`SmallGroup(96,197)`

For instance, we can use the following assignment in GAP to create the group and name it :

`gap> G := SmallGroup(96,197);`

Conversely, to check whether a given group is in fact the group we want, we can use GAP's IdGroup function:

`IdGroup(G) = [96,197]`

or just do:

`IdGroup(G)`

to have GAP output the group ID, that we can then compare to what we want.

### Other descriptions

Description | Functions used |
---|---|

DirectProduct(AlternatingGroup(4),DihedralGroup(8)) |
DirectProduct, AlternatingGroup, DihedralGroup |