title: sqrt, cbrt - what if don't want squared or cubed root, but any root?
body: <p>In maths libraries in Java and Clojure you can usually find a power (or exponent) function. In <code>java.lang.Math</code> it is <code>exp</code>. But I haven't been able to find a generic function for finding <em>any</em> root. In <code>java.lang.Math</code> you can get the squared root with <code>sqrt</code>, and the cubed root with <code>cbrt</code>. What if I want to find the 4th root? I am looking for an implementation or the formula. </p>