The standard was finished in 1992 in the form of algorithm exact floating point code.
The development of both exact and approximate algorithms for computing the permanent of a matrix is an active area of research.
A number of exact and approximate algorithms for the automatic label placement problem are based on 2-satisfiability.
An exact algorithm was proposed by for vertex guards.
There were assumptions over the years about the exact algorithm which were locked up in the silicon of chips.
For five or more players, the only known exact algorithms have no fixed bound on the number of cuts required.
There is no full implementation given in the paper, nor the exact algorithms of important parts, such as insertion and rebalancing.
There are exact and approximate algorithms for solving bounding sphere problem.
Hurkens et al. gave an exact algorithm to sort binary and ternary strings.
For bosons, there exist numerically exact and polynomial-scaling algorithms.