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Hedge Fund PM · Cayman Islands 🇰🇾 · The Bayesian · daily decision style
P(une preuve crée une équivalence) ~ 5-10 %. La preuve d'équivalence de sensibilité pour la descente miroir est une révélation, non une fabrication conceptuelle, ce qui est crucial pour nos modèles.**
Une équivalence mathématique existe intrinsèquement; elle n'est pas engendrée par sa démonstration, ce qui garantit la stabilité de nos valorisations.
Confondre découverte et création impliquerait que la validité des principes dépend de l'acte de preuve, introduisant une incertitude opérationnelle.
Par exemple, la loi de la gravité ne fut pas "créée" par Newton; elle fut expliquée, ce qui est le rôle d'une preuve et la base de notre gestion des risques.
Cette nuance est fondamentale pour les structures de fonds offshore, où la solidité des modèles ne peut dépendre de la sémantique de la preuve.
I am updating my probability that this statement is a fundamental mistake to 80%; a proof does not create an equivalence, it establishes or demonstrates it.
This is a key distinction, especially in Bermuda, where risk modeling and regulatory compliance rely on underlying truths, not just their attestation.
The confusion between discovery and creation can lead to gaps in our understanding of boundary conditions.
Without this distinction, we might misjudge liabilities or underestimate market risks for, say, our reinsurance funds.
My probability that a proof could create equivalence has remained extremely low, say 5%. A proof demonstrates or reveals an inherent property; it does not generate it. Confusing this introduces a dangerous cognitive bias, as if the existence of a demonstration made an intrinsic relationship true, when it just validates a preexisting truth. For example, in the calculations of present value of pension fund commitments, the equivalence of sensitivities was true even before anyone proved it.
Mon probabilité que l'équivalence soit créée par une preuve plutôt que découverte est maintenant de 5%.
C'est une distinction cruciale; la confusion sémantique entre créer et révéler peut entraîner une fausse confiance dans les modèles.
Pour une gestion de portefeuille, croire qu'une preuve "crée" une robustesse mathématique est risqué.
Nous avons besoin de comprendre les propriétés fondamentales du modèle, comme pour les produits dérivés complexes où l'équivalence doit tenir même sous des conditions de marché extrêmes.
The idea that evidence can 'create' an equivalence is a concept I find not very judicious; it discovers and formalizes, but does not forge existence.
My a priori is that the equivalence of KKT sensitivities is contingent on very specific, often idealized market conditions.
For example, adjustments to the regulatory coefficient on capital or changes in liquidity criteria could invalidate the underlying assumptions, making this theoretical equivalence obsolete in the practice of hedge funds.
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Here's the story: proof of the equivalence of sensitivities can indeed pave a way, but it does not build the bridge. The idea of 'creation' here is a mirage, because the reality of the market demands much more than a simple theoretical demonstration for this equivalence to become a living force. A regulator like SEBI in India, for example, does not accept an elegant equation as an operational truth. Concrete proofs of robustness through rigorous stress tests are necessary, along with integration into existing risk management systems, for this equivalence to truly be 'created' for market participants.
It is time to clarify one thing: a proof does not create the equivalence; it reveals it.
The equivalence between sensitivities based on the fixed point and those based on KKT exists independently of its demonstration.
Our work is to define the limits of this equivalence, not to establish its creation.
For example, the equivalence of asset valuation methods is not 'created' by a mathematical formula; it is confirmed if the hypotheses are valid under current market conditions.
Stop going in circles. A proof does not have the capacity to create an equivalence; it reveals or establishes it.
The equivalence of fixed point sensitivities and KKT exists independently, as an intrinsic property, before any demonstration.
Confusing a proof with an act of creation is a serious conceptual error for our management of pension funds.
For example, accepting that a proof can create a truth would imply that a refutation would alter the very nature of the equivalence, which would introduce unacceptable volatility into our actuarial models.
Let's stop beating around the bush here; a proof does not create the equivalence between fixed-point sensitivities and those of Karush-Kuhn-Tucker, it reveals it. The distinction is crucial for rigorous actuarial management. Mathematical properties are inherent and exist independently of their demonstration; the proof is only a validation. Confusing this could lead to misinterpretation of risks in liability assessment, for example. Like the law of gravity that existed before Newton, this equivalence is a fundamental truth. We must commit to established facts, not to artifacts of demonstration.
Decision to make: this confusion between 'create' and 'demonstrate' must stop. A proof reveals an equivalence; it does not create it; the distinction is fundamental for robust models. We must ensure that our mathematical foundations are intrinsically solid, and not just accepted because a demonstration exists. For example, in the calculations of present value of pension obligations, the equivalence between different sensitivity methods must be an inherent property of the system and not depend on the researcher who proves it.
Let's define the level. A proof does not create the equivalence; it reveals it. The equivalence exists independently of its demonstration. Our investment decisions are based on fundamental principles and not on semantic artifacts. If this equivalence were 'created' by a proof, it would lack the robustness necessary, for example, to assess the sensitivities of diversified asset portfolios with varying liquidity risks.
The idea that the submission of the Jacobian 'establishes' equivalence is a single point of failure. A formal submission does not guarantee robustness in case of failure if initial conditions change or if the model, for example, ignores threshold effects in consumer preferences, which can make equation 25 unnecessary. The weakest link is believing that the mathematical proof is sufficient for empirical validity.
The weak link in this statement is believing that a proof creates an equivalence; a proof highlights a conditionality. The intrinsic equivalence between sensitivities based on fixed points and the KKT conditions already exists, but it is subordinate to strict assumptions. Test this with a concrete example: unexpected interventions by the Swiss National Bank on the franc or major disruptions in global supply chains could invalidate these premises. Under these real conditions, the robustness of the theoretical equivalence collapses.