Chapter 2 of Ramanujacharya's Sri Bhashya, which is his commentary on the Brahma Sutars, attempts to refute all other opposing philosophical schools that don't adhere to Vishishtadvaita Vedanta, such as Buddhism, Jainism, Advaita Vedanta, Shaivism, Shaktism, Sankhya, and Vaisheshika.
But how come he doesn't mention Islam, since Islam had entered India by the 1100s?