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    An infinitesimal hyperreal exists — Carmelics
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    Home/Modality & Possibility
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    An infinitesimal hyperreal exists

    Modality & PossibilityProof of definition segments
    ?Rate how convincing each reason is below to see the overall strength.
    1 reason for
    2 reasons against

    Reasons For

    1 perspective
    Reason for
    ?
    • 1.An infinite hyperreal a exists such that a > n for every natural number n
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    • 2.The reciprocal 1/a of an infinite hyperreal a exceeds 0 and is smaller than 1/(n+1) for every natural number n
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    Reasons Against

    2 perspectives
    Reason against 1 of 2
    ?
    • 1.Mathematical existence requires either explicit construction or derivation from axioms accepted as ontologically committed, not merely consistency.
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    • 2.The hyperreals exist only relative to a non-constructive ultrafilter whose existence depends on the Axiom of Choice, making their ontological status model-relative rather than absolute.
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    • 3.A quantity that cannot be specified, measured, or distinguished within any physical or computational procedure lacks the determinate existence required for mathematical realism.
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    Reason against 2 of 2
    ?
    • 1.Berkeley's critique in 'The Analyst' established that infinitesimals generate logical contradictions when treated as both zero and nonzero within the same deductive system.
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    • 2.Robinson's hyperreals evade Berkeley's contradiction only by relocating infinitesimals to a non-standard model, meaning standard mathematics remains committed to no infinitesimal quantities.
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    • 3.Existence claims about entities visible only from outside the standard model are epistemically inaccessible and thus philosophically idle for grounding mathematical practice.
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    Topics

    Modality & PossibilityProof of definition segments

    Related

    A quantity that cannot be specified, measured, or distinguished within any physi...An infinite hyperreal a exists such that a > n for every natural number nBerkeley's critique in 'The Analyst' established that infinitesimals generate lo...Existence claims about entities visible only from outside the standard model are...
    +4 moreShow less
    Mathematical existence requires either explicit construction or derivation from ...Robinson's hyperreals evade Berkeley's contradiction only by relocating infinite...The hyperreals exist only relative to a non-constructive ultrafilter whose exist...The reciprocal 1/a of an infinite hyperreal a exceeds 0 and is smaller than 1/(n...

    Similar

    An infinite (nonstandard) hyperreal exists93%Nonstandard infinitesimal hyperreals exist in substantial number93%Nonstandard hyperreals must exist87%The set of infinitesimal hyperreals has no least upper bound.85%

    Source

    AI-extracted1/3 agreementValid
    SEP: continuity
    View source passageHide passage
    Now suppose that the set \(\bbN\) of natural numbers is a member of \(U\). Then so is the set \(\Re\) of real numbers, since each real number may be identified with a set of natural numbers. \(\Re\) may be regarded as an ordered field, and the same is therefore true of its inflate \(\hat{\Re}\), since the latter has precisely the same first-order properties as \(\Re\). \(\hat{\Re}\) is called the hyperreal line, and its members hyperreals. A standard hyperreal is then just a real, to which we sh
    Extraction notes

    Validity: Extracted via Max plan + API grounding/validity checks

    Details

    Type
    claim
    Perspectives
    3 (1 for, 2 against)
    Edits
    1 edit