Leibnizian

Initially, the Cartesian and Leibnizian traditions prevailed on the Continent (leading to the dominance of the Leibnizian calculus notation everywhere except Britain).

Critical Survey of Short Fiction (2001) It begins with a young man, Candide, who is living a sheltered life in an Edenic paradise and being indoctrinated with Leibnizian optimism (or simply "optimism") by his mentor, Professor Pangloss.

Interestingly, this critique of Voltaire's seems to be directed almost exclusively at Leibnizian optimism.

Primary among these is Leibnizian optimism (sometimes called Panglossianism after its fictional proponent), which Voltaire ridicules with descriptions of seemingly endless calamity.

Specifically, he observed that both Newtonian and Leibnizian calculus employed infinitesimals sometimes as positive, nonzero quantities and other times as a number explicitly equal to zero.

Voltaire actively rejected Leibnizian optimism after the natural disaster, convinced that if this were the best possible world, it should surely be better than it is.