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It is not the case that Real numbers like √2 are defined by Dedekind cuts, which partition the rationals without requiring any independent measuring capacity.
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Reasons For
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Reason for
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1.
Dedekind cuts define reals *in terms of* rationals, but this doesn't explain why rationals themselves have the ordering properties cuts depend on.
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2.
Claiming Dedekind cuts require no 'measuring capacity' conflates mathematical definition with metaphysical existence—definition alone doesn't establish what √2 *is*.
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3.
The construction is circular: we justify reals by appeal to rational structure, yet the entire framework presupposes intuitions about infinite ordered sets.
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Reasons Against
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Reason against
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1.
Dedekind cuts are purely relational structures over rationals, requiring no reference to physical measurement or geometric intuition.
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2.
This construction explains why √2 exists mathematically without presupposing it as a pre-existing entity independent of rational order.
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3.
The approach unifies real numbers within set theory, avoiding mysterious 'gaps' that seem to require extra-mathematical grounding.
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