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# Type::Integer

Type and property representing integers

### Use only in the MuPAD Notebook Interface.

This functionality does not run in MATLAB.

## Syntax

```testtype(obj, Type::Integer)
assume(x, Type::Integer)
is(ex, Type::Integer)
```

## Description

Type::Integer represents integers. This type can also be used as a property to mark identifiers as integers.

The call testtype(obj, Type::Integer) checks, whether obj is an integer number and returns TRUE, if it holds, otherwise FALSE.

testtype only performs a syntactical test identifying MuPAD® objects of type DOM_INT.

The call assume(x, Type::Integer) marks the identifier x as an integer number.

The call is(ex, Type::Integer) derives, whether the expression ex is an integer number (or this property can be derived).

This type represents a property that can be used in assume and is.

## Examples

### Example 1

The following numbers are of type Type::Integer:

```testtype(0, Type::Integer), testtype(55, Type::Integer),
testtype(-111, Type::Integer)```

### Example 2

We use this type as a property:

`assume(x, Type::Integer):`

The following calls to is derive the properties of a composite expression from the properties of its indeterminates:

`is(3*x, Type::Real), is(2*x, Type::Even), is(x/2, Type::Integer)`

`assume(y, Type::Integer): is(x + y^2, Type::Integer)`

`unassume(x), unassume(y):`

## Parameters

 obj Any MuPAD object x An identifier or a mathematical expression containing identifiers ex

## Return Values

See assume, is and testtype