We can consider a Residue Number System (R.N.S.) that has efficient operations for add, multiply, and compare between two numbers.
A more rigorous definition
We can suppose that we can perform the operations above between two non-negative integers $x$ and $y$ with $x \ge y$ in time proportional to $O(x\log(x))$ with $O(\log(x^2))$ memory. Or further, if it would possibly allow even more uses, if we could perform these operations in time linear with respect to $x$ and $y$.
What are the potential uses of this system?
For example, cryptology often uses fairly large numbers, and makes use of such a system. Also, linear programming and systems of linear equations can make use of an efficient R.N.S. Also, specialized processors can have R.N.S.'s built in, and could potentially compete with standarized Boolean processors.
What additional uses would this efficient system allow?