Kanada
In ancient India, Buddhists, Hindus and Jains all developed their own theories of matter. They posited, essentially, that all matter is made up of atoms. They were, in themselves, eternal, indestructible and innumerable. They would associated and disassociate, allowing fundamental natural laws to form more complex matter and change over time. Theories of soul were often put into these theories of matter. For example, In Jainism, the soul was included (jiva.) Qualities such as taste, touch, color and smell were added to each atom.
Kanada was an ancient Indian natural scientist and philosopher. He founded a school of Indian philosophy that is now considered the earliest Indian physics.
He is known for having developed the foundations of the atomistic approach to physics and philosophy.
Kanada proposed that paramanu (atom) was an indestructible particle of matter. It was indivisible because it was in a state where measurement could not be attributed to it.
The atom was indestructible, and hence, eternal. They were minute objects, invisible to the naked eye.
Dvyanuka was a composite, and as its name suggests, is a composite of two atoms. Tryanuka is a name for triatomic particles.
Kanada said that there were two different kinds of atoms: two with mass and two without. Each subsistence would consist of all four types of atoms.
Jains believe in the 6 Dravya, or 'eternal substances.' Jiva - living entity. The remaining 5 Dravya are Ajiva or non-ensouled beings. Jiva is also called 'jivatman,' a core concept in Jain theology. The soul is believed to be eternal. Jiva is pure consciousness. Jiva has innate free will.
Pudgala is one of the 6 Dravya.
'pud' means 'supplement' while 'gala' means 'disintegration.' Thus, matter is constantly changing by this process.
Paramanu is the individual unit of pudgala. Through the process of supplementation, paramanu can form aggregates of pudgala. These aggregates are known as Skandha.