abstract:Udayana also known as Udayanācārya (Udyanacharya, or "Master Udayana) lived in the 10th century, in Kariyan village in Mithila, near present day Darbhanga, Bihar state, India. Udayana was a very important Hindu logician who attempted to reconcile the views held by the two major schools of logic (Nyaya and Vaisheshika).