He most likely started his studies in philosophy along with Abu al-Qasim al-Kirmani in the Buyid city of Ray in northern Iran.
[1] The work was compiled sometime between 1024 and 1037, during Avicenna's stay in Isfahan, the capital of the Kakuyid ruler Muhammad ibn Rustam Dushmanziyar (r. 1008–1041).
[1][3] Bahmanyar and Avicenna possibly encountered each other in 1014/5 at Ray, when the latter worked for Sayyida Shirin and Majd al-Dawla.
[1] Bahmanyar's main work, the Kitāb al-taḥṣīl ("The Summation"), which summarises Avicenna's logic, physics and metaphysics was written between 1024 and 1037 and dedicated to his Zoroastrian uncle, Abu Mansur Bahram ibn Khurshid ibn Yazdyar, who was possibly the son of the treasurer of the Buyid emperor Adud al-Dawla (r. 949–983).
[1][4] Abu'l-Hasan Bayhaqi (d. 1169) writes that Bahmanyar also wrote a book on logic and one on music and other works are attributed to him.