About Reductio ad absurdum

In logic, reductio ad absurdum, also known as argumentum ad absurdum or apagogical arguments, is the form of argument that attempts to establish a claim by showing that the opposite scenario would lead to absurdity or contradiction. This argument form traces back to Ancient Greek philosophy and has been used throughout history in both formal mathematical and philosophical reasoning, as well as in debate.
Nāgārjuna (right) and Āryadeva (middle).

Madhyamaka – Buddhist philosophy and practices

Madhyamaka also known as Śūnyavāda and Niḥsvabhāvavāda refers to a tradition of Buddhist philosophy and practice founded by the Indian philosopher Nāgārjuna. The foundational text of the Mādhyamaka tradition is Nāgārjuna's Mūlamadhyamakakārikā. More broadly, Madhyamaka also refers to the ultimate nature of phenomena and the realization of this in meditative equipoise. According to the classical madhyamaka thinkers, all phenomena () are empty (śūnya) of "nature," a "substance" or "" (svabhāva) which gives them "solid and .