# Direct product of M16 and Z2

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## Contents

## Definition

The **direct product of M16 and Z2** is defined as the group obtained as the external direct product of the group M16 and the cyclic group of order two.

## Position in classifications

View the full list 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 | 13 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 37 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(32,37)`

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

`gap> G := SmallGroup(32,37);`

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

`IdGroup(G) = [32,37]`

or just do:

`IdGroup(G)`

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

### Other descriptions

The group can be described using the DirectProduct, SmallGroup, and [{GAP:CyclicGroup|CyclicGroup]] functions:

`DirectProduct(SmallGroup(16,6),CyclicGroup(2))`