c. 500–70 CE). Major Indian philosopher of the Madhyamaka school of Buddhism. A major mark of Bh vaviveka's thought is the division of reality into ultimate truth ( param rthasatya ) and conventional truth ( samv tisatya ), by which self-existence ( svabh va ) is asserted as a conventional truth but not as an ultimate one. Bh vaviveka's principal works are the Prajñ prad pa (Light of Wisdom), which is a commentary on N g rjuna's Mulamadhyamak karik s , and the Madhyamakah dayak rik s