Nagarjuna's Shunyavada is expounded in Madhyamika philosophy.

Madhyamika Philosophy:
Madhyamika philosophy is based on the teachings of Buddha and developed by Nagarjuna. Madhyamika means "middle way" or "middle path" and it emphasizes the concept of emptiness or shunyata.

Shunyavada:
Shunyavada is the concept of emptiness or the absence of inherent existence of any phenomenon. Nagarjuna believed that everything is interdependent and nothing exists independently. He argued that the concepts of existence and non-existence are equally flawed as they both assume an inherent existence.

Key concepts of Shunyavada:

- Emptiness: Nagarjuna argued that everything is empty of inherent existence. Everything exists in relation to other things and is dependent on other factors. Therefore, everything is empty of its own essence or nature.

- Dependent origination: Nagarjuna believed that everything arises dependently and nothing exists independently. Everything is interdependent and interconnected.

- Two truths: Nagarjuna introduced the concept of two truths - conventional truth and ultimate truth. Conventional truth refers to the world as we experience it, while ultimate truth refers to the emptiness or shunyata of all phenomena.

- Middle way: Nagarjuna emphasized the middle way between existence and non-existence, between eternalism and nihilism. He believed that the true nature of reality lies beyond these extremes.

In conclusion, Nagarjuna's Shunyavada is expounded in Madhyamika philosophy, which emphasizes the concept of emptiness or shunyata. It is based on the idea that everything is interdependent and nothing exists independently. Nagarjuna introduced the concepts of dependent origination, two truths, and the middle way to explain the nature of reality.