# Math.ln

## Function

Natural logarithm. Returns the natural logarithm of value.

## Syntax

```bt
Math.ln(value)
```

## Parameters

| Parameters | Type | Required | Default value | Description |
| ------ | ------ | ------ | ------ | ------ |
| value | Number | is | None | a true number. |

## Return value

| Type | Description |
| ------ | ------ |
| Int/Float | Returns the natural logarithm of value. An Int is returned for integer results, and a Float for non-integer or non-finite results. |

## Example

```bt
result = Math.ln(Math.E)

// Output: 1
print result
```

## Notes

- When value is less than 0, NaN is returned according to f64 rules.