# Direct product of D8 and Z4

From Groupprops

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## Contents

## Definition

This group is defined as the direct product of the dihedral group of order eight and cyclic group of order four.

## Position in classifications

Get more information about groups of the same order at Groups of order 32#The list

Type of classification | Position/number in classification |
---|---|

GAP ID | , i.e., among groups of order 32 |

Hall-Senior number | 14 among groups of order 32 |

Hall-Senior symbol |

## Arithmetic functions

Want to compare and contrast arithmetic function values with other groups of the same order? Check out groups of order 32#Arithmetic functions

## GAP implementation

### Group ID

This finite group has order 32 and has ID 25 among the groups of order 32 in GAP's SmallGroup library. For context, there are 51 groups of order 32. It can thus be defined using GAP's SmallGroup function as:

`SmallGroup(32,25)`

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

`gap> G := SmallGroup(32,25);`

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

`IdGroup(G) = [32,25]`

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 | Mathematical comment |
---|---|---|

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