Should I cite the definition of a standard problem that is widely know by the community in my thesis? For example the travelling salesman problem (TSP) is a very well known problem in computer science (dating back to the 1800s). To ensure accuracy I would refer to other sources for the formal definition, but these sources are very far removed from the original formulation of the problem.
Not sure if it makes a difference but I would potentially using different symbols as some of them could conflict with other uses throughout the document.