Feferman argued that Kreisel's autonomy condition is epistemically circular: recognizing a progression as finitistically legitimate already presupposes the ordinal comprehension it purports to generate.
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Kreisel(as a historical figure in logic and philosophy of mathematics)
Georg Kreisel (1923–2015), a mathematical logician who studied how mathematical reasoning works and whether we can be certain about mathematical truths.
Ordinal comprehension(as the mathematical concept that's supposedly being justified)
The ability to understand and work with ordinals, which are special numbers mathematicians use to measure the size and structure of infinite collections in an organized way.
Presupposes(as describing what Plantinga's argument takes for granted)
Assumes something to be true without proving it—like how an argument might presuppose that logic works, without first arguing that logic is valid.