# Fourth Root of Epsilon > [Fourth root][nth-root] of [double-precision floating-point epsilon][@stdlib/constants/float64/eps].

## Usage ```javascript var FLOAT64_FOURTH_ROOT_EPS = require( '@stdlib/constants/float64/fourth-root-eps' ); ``` #### FLOAT64_FOURTH_ROOT_EPS [Fourth root][nth-root] of [double-precision floating-point epsilon][@stdlib/constants/float64/eps]. ```javascript var bool = ( FLOAT64_FOURTH_ROOT_EPS === 0.0001220703125 ); // returns true ```

## Examples ```javascript var FLOAT64_FOURTH_ROOT_EPS = require( '@stdlib/constants/float64/fourth-root-eps' ); var out = FLOAT64_FOURTH_ROOT_EPS; // returns 0.0001220703125 ```

[nth-root]: https://en.wikipedia.org/wiki/Nth_root [@stdlib/constants/float64/eps]: https://www.npmjs.com/package/@stdlib/constants/tree/main/float64/eps