The abbreviation ‘W R T’ stands for ‘with respect to’. In mathematical discussions, it is commonly used to specify the variable that is being considered in relation to a particular operation or function.
For example, if you have a function f(x) and you say that you want to differentiate it W R T x, this means you want to find the derivative of the function with respect to the variable x. It clarifies which variable is being treated as the independent variable in the context.
This notation is particularly useful in calculus, physics, and engineering, where you often deal with multiple variables. By specifying ‘W R T’, you can clearly communicate which variable is being focused on, avoiding confusion that might arise when dealing with multiple quantities.