I've just added 2 more wikis. They are -
Also, one thing more I would like to add here is that some of the wikis like Gamma Functions, Beta Functions, Digamma Function, etc, are a part of my multiple summations wiki. I encourage all users to read about them before proceeding to learn about multiple summations. I'll make a wiki on multiple summations as soon as I finish writing wikis on basic techniques and advanced problem solving techniques.
Hope you have a good time reading these.