The influence of Western logic is not a major challenge in the study of Indian logic, as it has helped to shed light on the similarities and differences between Indian and Western logical systems.

The Nyaya Sutras are the primary source of information about ancient Indian logic. They were written by the sage Gautama and are considered to be the foundation of the Nyaya school of logic.

The existence of a universal logic is not a major controversy in the study of Indian logic, as most scholars agree that there is no such thing.

The diversity of logical systems and theories is a major challenge in the study of Indian logic, as it makes it difficult to generalize about the nature of Indian logic.

The nature of the anumana (inference) is a major controversy in the study of Indian logic, as there are different views on what constitutes a valid inference.

The scarcity of primary source materials is a major challenge in the study of Indian logic, as it makes it difficult to reconstruct the history of Indian logic and to understand the development of logical ideas.

The role of language in logic is a major controversy in the study of Indian logic, as there are different views on the relationship between language and thought.

The lack of a unified and standardized terminology is a major challenge in the study of Indian logic, as it makes it difficult to compare and contrast different logical systems and theories.

The relationship between logic and metaphysics is a major controversy in the study of Indian logic, as there are different views on the extent to which logic is dependent on metaphysics.

The influence of Western logic on the study of Indian logic is a major challenge, as it has led to the neglect of some important aspects of Indian logic.