CHAPTER 20 – U

This chapter presents a list of built-in Mathematica objects starting with the alphabet U. It discusses these objects and illustrates their use. Some of these objects mentioned in the chapter are UnAlias, Underflow, Unevaluated, Uninstall, Union, and Unique. UnAlias is a system command with the attributes HoldAll and Protected. Underflow [ ] results when a numerical calculation is too small to represent. Unevaluated [expression] is used as an argument for functions so that expression remains unevaluated as the argument of a function. Unprotect is used to remove the attribute Protected. Using is an option used with Roots to indicate subsidiary equations to be used in the solution process. Upvalues serves to determine the list of upvalues for a particular symbol and to assign upvalues to symbols. Unique generates new symbols with unique names.