# LOG2E > Base 2 logarithm of the mathematical constant [_e_][eulers-number].

## Usage ```javascript var LOG2E = require( '@stdlib/constants/float64/log2-e' ); ``` #### LOG2E Base 2 logarithm of the mathematical constant [_e_][eulers-number]. ```javascript var bool = ( LOG2E === 1.4426950408889634 ); // returns true ```

## Examples ```javascript var LOG2E = require( '@stdlib/constants/float64/log2-e' ); console.log( LOG2E ); // => 1.4426950408889634 ```

[eulers-number]: https://en.wikipedia.org/wiki/E_%28mathematical_constant%29