Indeed you have to use "Cartesian", not "cartesian"... [Y]
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Sextus"Cartesina" looks like a typo. Here's a characteristic appearance:
I've seen the expression "cartesina skepticism". Shouldn't it be "Cartesian", as is the case with "Kantian" (Kant) and "Humean" (Hume)?
Best,
Sextus