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.
Utah. Posts. 1,997. PB is the sole survivor of what was intended to be an entire line of propellants. The concept was to have a generic powder kernel that was porous, and to add the various inhibitors and additives to tailor burn rate, flash and other characteristics to the sponge-like kernels as needed.