how to check independence r check whether function is independent if r is independent what function how to check the independence of functions in r why is $u_1 and $u_2 independent functions when checking independence in r how to check independence in r code when determining the independence of an r function which function checks for independence how to check if something in r is independent which function checks r independence if a function is independent how to check it if the function is independence check if r function is independent what is the independence of a function in r r check for independent function check independence in r function how to prove independence of functions in r r how to check independence r functions are independent