# LN2 > [Natural logarithm][@stdlib/math/base/special/ln] of `2`.

## Usage ```javascript var LN2 = require( '@stdlib/constants/float64/ln-two' ); ``` #### LN2 [Natural logarithm][@stdlib/math/base/special/ln] of `2`. ```javascript var bool = ( LN2 === 0.6931471805599453 ); // returns true ```

## Examples ```javascript var LN2 = require( '@stdlib/constants/float64/ln-two' ); console.log( LN2 ); // => 0.6931471805599453 ```

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## C APIs

### Usage ```c #include "stdlib/constants/float64/ln_two.h" ``` #### STDLIB_CONSTANT_FLOAT64_LN2 Macro for the [natural logarithm][@stdlib/math/base/special/ln] of `2`.

* * * ## See Also - [`@stdlib/constants/float64/ln-ten`][@stdlib/constants/float64/ln-ten]: natural logarithm of 10.

[@stdlib/math/base/special/ln]: https://www.npmjs.com/package/@stdlib/math-base-special-ln [@stdlib/constants/float64/ln-ten]: https://github.com/stdlib-js/constants/tree/main/float64/ln-ten