Axiom is  a general purpose Computer Algebra system. It is useful for research and development of mathematical algorithms. It defines a strongly typed, mathematically correct type hierarchy. It has a programming language and a built-in compiler.
Polybutylene is simply a type of plumbing material that was manufactured between the late 70's and early 90's. It is thought that it was installed in over 6 million homes during that time period.
Both of these pipes have many differences that make both of them, exceptional and one of their own kind. PB is basically made of a plastic resin material that was used for plumbing pipes because of its features, like flexibility, cost effectiveness, freeze resistance etc. Unfortunately, people have not accepted these pipes due to its weak features that cause them loss.