The Sarvastivadin school of Buddhism was particularly strong in northwest India, especially Kashmir and Mathura. Kashmir became a major center of Sarvastivada scholarship, producing influential commentaries. They believed all dharmas exist in past, present, and future (sarvastivada means 'all exists'). Tibet/Nepal had Vajrayana later, Burma/Thailand followed Theravada, and Bihar/Bengal were strongholds of other schools.