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    Feasibility is preserved under limited recursion on notation — Carmelics
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    Feasibility is preserved under limited recursion on notation

    Modality & PossibilityTruth & Knowledge
    ?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.The basis functions F_0 are feasibly computable
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    • 2.Feasibility is preserved under composition
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    • 3.When f(x,y) is defined by limited recursion on notation, the number of recursive steps is proportional to the length of y's binary representation rather than to the value of y itself
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    Reasons Against

    2 perspectives
    Reason against 1 of 2
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    • 1.The polynomial bound on auxiliary functions presupposes a fixed machine model, but feasibility judgments are model-relative in ways that undermine universal closure claims.
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    • 2.Cobham's original characterization of feasibility via limited recursion on notation tacitly assumes sequential computation, excluding parallel models where the bound fails to generalize.
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    Reason against 2 of 2
    ?
    • 1.Intensional properties of functions—such as how a computation proceeds, not just its input-output behavior—are not preserved under compositional closure, as Kreisel's squeezing arguments reveal.
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    • 2.If feasibility is an epistemic or pragmatic notion tracking humanly tractable computation, then formal closure under recursion on notation conflates mathematical tractability with physical realizability.
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    Proof of definition segments2 linked

    Related

    Cobham's original characterization of feasibility via limited recursion on notat...Feasibility is preserved under compositionIf feasibility is an epistemic or pragmatic notion tracking humanly tractable co...Intensional properties of functions—such as how a computation proceeds, not just...
    +4 moreShow less
    The basis functions F_0 are feasibly computableThe polynomial bound on auxiliary functions presupposes a fixed machine model, b...This length-bounded recursion places a polynomial bound on auxiliary functions c...When f(x,y) is defined by limited recursion on notation, the number of recursive...

    Similar

    Feasibility is preserved when a function is defined by limited recursi...94%Feasibility is preserved under limited recursion on notation, because ...90%Feasibility of computation is preserved when a function is defined by ...88%Limited recursion on notation preserves feasibility because recursion ...81%

    Source

    AI-extracted1/3 agreementValid
    SEP: computational-complexity
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    We define the class \(\mathcal{F}\) of functions definable by limited recursion on notation to be the least class containing \(\mathcal{F}_0\) and closed under composition and the foregoing scheme. 4 (Cobham 1965; Rose 1984) \(f(\vec{x}) \in \textbf{FP}\) if and only if \(f(\vec{x}) \in \mathcal{F}\). 4 is significant because it provides another machine-independent characterization of an important complexity class. Recall, however, that Cobham was working at a time when the mathematical status
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    Details

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