Vivarana is a subschool of classical Advaita Vedanta, established by Prakasatman (c.
[1] The name of the Vivarana-school is derived from Prakasatman's Pancapadika-Vivarana, a commentary on the Pancapadika by Padmapadacharya.
[1] Prakasatman was the first to propound the theory of mulavidya or maya as being of "positive beginningless nature".
[2] According to Roodurmum, "his line of thought [...] became the leitmotif of all subsequent developments in the evolution of the Advaita tradition.
Critics object that Brahman is pure consciousness, so it can't be the source of avidya.