The Mūlamadhyamakakārikā (मूलमध्यमककारिका), abbreviated as MMK, is the foundational text of the Madhyamaka school of Mahāyāna Buddhist philosophy. It was composed by the Indian philosopher Nāgārjuna (approximately around 150 CE). The MMK makes use of reductio arguments to show how all phenomena (dharmas) are empty of svabhava (which has been variously translated as essence, own-being, or inherent existence). The MMK is widely regarded as one of the most influential and widely studied texts in the history of Buddhist philosophy. The MMK had a major impact on the subsequent development of Buddhist thought, especially in Tibetan Buddhism and East Asian Buddhism. The MMK is the work of Nāgārjuna, an Indian Buddhist monk and philosopher writing in Sanskrit. Very little is known about this figure, including exactly where he lived (somewhere in the Indian subcontinent), exactly what time (some time around the 2nd or 3rd century CE), and how many texts he composed. As with many early Indian historical figures, the biographical information which does exist is mainly hagiographical and from later periods. Most scholars agree that Nāgārjuna was a Mahāyāna Buddhist who believed all things (dharmas) to be empty, or without an intrinsic existence and nature (svabhāva). Beyond that, little can be said about him with certainty. During the second and third centuries, Mahāyāna ideas were held by a minority of Buddhists in India who lived within the communities of Nikāya Buddhism (i.e. non-Mahāyāna Buddhism). Although all the major Buddhist schools at the time held that the person was empty of any eternal self or soul, some of the Abhidharma schools conceived of dharmas (transient phenomena, impermanent events) as ultimately real entities (dravyata) that had essences or "intrinsic natures" (svabhāva). These intrinsic natures were seen as an independent part of a phenomenon, an inherent self-sufficiency that was not caused by something else. Abhidharma schools like the Vaibhasikas accepted this doctrine and did not see it as conflicting with the idea of dependent origination.