Gladly! > So is "T" and "N" conventionally used in numerical optimization as the transform "variables" (like X and Y are in calculus)? Not really, numerical o

Gladly! > So is "T" and "N" conventionally used in numerical optimization as the transform "variables" (like X and Y are in calculus)? Not really, numerical optimization offers a general toolbox for various problems, which are usually defined based on domain-specific notation and concepts. So the concept of a transformation like the one described in the article is not general to numerical optimization, but specific to the optimization being done here. That being said, when talking about techniques, theorems and algorithms in numeric optimization there are conventions. So you usually move between the more theory-oriented notation to a domain-specific notation (in the article I mostly used the domain-specific, lazy notation I chose). Bear in mind that my perspective is not very academic so I might feel less strongly about (and be less aware of) rigorous mathematical conventions.