His philosophical research was full of Cartesianism, always replacing intuitive judgments with rigorous logical deductions.

Cartesianism 是由人名 Descartes（笛卡尔）加上后缀 -ism 构成的名词。Descartes 是法国著名哲学家，-ism 表示"主义、学说"，所以 Cartesianism 指"笛卡尔主义"，即笛卡尔创立的哲学体系，强调理性思考和逻辑推理。