I want to know the answer to the following question:
In what centuries the writings of scholars been used to debate the philosophies?
All the background I'm provided with is that "Scholars have debated the relationship and differences within āstika philosophies and with nāstika philosophies, starting with the writings of Indologists and Orientalists of the 18th and 19th centuries, which were themselves derived from limited availability of Indian literature and medieval doxographies.". Is that enough to answer the question?