unrevisable

— Kuhn himself had repeatedly ( 1983, 1993 ) suggested that these propositions resemble Kant’s synthetic a priori judgments, both in the sense that they cannot immediately be contraposed to experience and in that they play an ineliminable role in shaping experience itself, while denying at the same time that these principles have a fixed and unrevisable character (unlike Kant’s own synthetic a priori judgements).