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.
SharkBite continues to lead the industry with an expansive line of fittings, valves and other innovative, labor saving products for plumbing projects. SharkBite push-fit fittings are the fastest, easiest way to join copper, CTS CPVC and PEX in any combination. With no soldering or glue. Certified: 200 psi & 200F (93 C). Use Sharkbite plumbing fittings for new installation and repair of potable water distribution systems.