A normalization condition is not 'additional structure' in the substantive sense but rather a conventional choice internal to the conformal framework, making the claim's notion of 'additional structure' question-begging.

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Conformal framework(used in physics and geometry): A mathematical or theoretical system (especially in physics) that preserves certain properties, like angles, when you transform or look at things from different perspectives.
Conventional choice(used in philosophy and science): A decision made based on agreement or established practice rather than being forced by nature or logic—something we chose to do this way, not something we had to do.
Normalization condition(used in physics and mathematics): A rule or constraint that you set up to make sure your mathematical or scientific framework works properly—it's like setting a standard so everything measures consistently.
question-begging(Epistemology, anti-skeptical argumentation): A charge leveled against anti-skeptical arguments that assume what they set out to prove, particularly in Putnamian externalist arguments

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