"Indian philosophy (Sanskrit: dar\u015Bhana) refers to the philosophical traditions of the Indian subcontinent. Since medieval India (ca.1000\u20131500), schools of Indian philosophical thought have been classified by the Brahmanical tradition as either orthodox or non-orthodox - \u0101stika or n\u0101stika - depending on whether they regard the Vedas as an infallible source of knowledge."@en . .