Purva Mimamsa is a school of Hindu philosophy that emphasizes the importance of Vedic ritual and dharma. It is also known as Karma Mimamsa, as it focuses on the performance of actions (karma) as a means to attain liberation (moksha). The main principles of Purva Mimamsa can be summarized as follows:

1. Authority of the Vedas The Vedas are considered to be the ultimate source of knowledge and authority in Purva Mimamsa. They are believed to be eternal and infallible, and their teachings are to be followed without question.

2. Emphasis on Rituals Purva Mimamsa places great importance on the performance of Vedic rituals, such as sacrifices, offerings, and recitation of mantras. These rituals are believed to have a specific purpose and are seen as a means to attain material and spiritual benefits.

3. Concept of Dharma Dharma, or duty, is a central concept in Purva Mimamsa. It refers to the moral and ethical code of conduct that one must follow in order to fulfill their duties and obligations in society. This includes following the rules and regulations prescribed by the Vedas.

4. Law of Karma Purva Mimamsa believes in the law of karma, which states that every action has a corresponding result. This means that one's actions in this life will determine their future consequences, whether in this life or the next.

5. Rejection of Salvation Unlike other schools of Hindu philosophy, Purva Mimamsa does not believe in the concept of salvation or liberation from the cycle of birth and death. Instead, it focuses on the performance of actions as a means to attain happiness and fulfillment in this life.

6. Importance of Interpretation Purva Mimamsa places great emphasis on the correct interpretation of the Vedas. It believes that the Vedas contain hidden meanings and must be studied and interpreted correctly in order to understand their true essence.

7. Rejection of God Purva Mimamsa does not believe in the existence of a supreme being or God. It sees the Vedas as the ultimate authority and does not consider the need for a creator or controller of the universe.

In conclusion, Purva Mimamsa is a school of Hindu philosophy that places great importance on the authority of the Vedas, the performance of Vedic rituals, and the concept of dharma. It also believes in the law of karma and the importance of correct interpretation of the Vedas.