Find a real minimum of a real function f(x) via bracketing. Given a function f and a range (ax..bx), returns the value of x in the range which is closest to a minimum of f(x). f is never evaluted at the endpoints of ax and bx. If f(x) has more than one minimum in the range, one will be chosen arbitrarily. If f(x) returns NaN or -Infinity, (x, f(x), NaN) will be returned; otherwise, this algorithm is guaranteed to succeed.
Inverse of the Log Minus Digamma function
Computes accurate sum of binary logarithms of input range r.