Recognition: 2 theorem links
· Lean TheoremToward Optimal Regret in Robust Pricing: Decoupling Corruption and Time
Pith reviewed 2026-05-12 02:15 UTC · model grok-4.3
The pith
A robust variant of binary search achieves regret O(C + log T) when corruption budget C is known in dynamic pricing.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
We develop the first regret guarantees for robust dynamic pricing that decouple the dependence on the corruption C and the time horizon T. In particular, we develop a robust variant of binary search that achieves regret O(C + log T) when the corruption C is known and O(C + log² T) when the corruption is unknown.
What carries the argument
Robust binary search that maintains an active interval for the unknown valuation and selects prices to detect and absorb at most C corrupted binary feedbacks while narrowing the search range.
If this is right
- Regret stays linear in the corruption budget C plus only logarithmic in T, so average per-round loss vanishes as T grows.
- When C is known the bound is additive and nearly tight; when C is unknown an extra logarithmic factor appears but the dependence on T remains decoupled.
- The seller can post prices that converge to the optimal revenue after a number of rounds linear in C plus logarithmic in T.
- The same separation applies to the unknown-C case, replacing the single log T with log squared T.
- Unlimited supply and binary feedback suffice for the guarantees, without needing richer observations.
Where Pith is reading between the lines
- The interval-narrowing logic could be adapted to other online decision problems that receive binary feedback under bounded corruptions, such as certain threshold-based bandit settings.
- If the valuation drifts slowly over time, the same corruption-handling mechanism might be restarted periodically without losing the additive-C property.
- The construction suggests that many binary-search-style algorithms in corrupted environments can be made robust by adding a small number of verification queries spaced at corruption scale.
- In finite-horizon deployments the method gives an explicit stopping rule once the remaining interval width is smaller than the per-round revenue loss tolerance.
Load-bearing premise
The buyer's valuation stays fixed and unknown across rounds while the adversary can corrupt at most C binary purchase feedbacks.
What would settle it
Execute the algorithm against an adversary that corrupts exactly C feedbacks and measure whether cumulative regret stays within O(C + log T) for known C; any systematic excess would disprove the bound.
Figures
read the original abstract
We design the first regret guarantees for robust dynamic pricing that decouple the dependence on the corruption $C$ and the time horizon $T$. In dynamic pricing, a seller with unlimited supply of a good interacts with a stream of buyers over \( T \) rounds, with the goal of maximizing revenue. At each round $t$, the seller posts a price $p_t$, and the buyer purchases the good only if their unknown valuation $v^\star$ exceeds this price. The seller observes only the binary feedback $\mathbb{I} \left\{ p_t \leq v^\star \right\}$, indicating whether a sale occurred. In the \emph{robust} pricing setting, a malicious adversary is allowed to corrupt this feedback in at most $C$ rounds. Even if the learner knows the corruption $C$, the best known regret bound is $\mathcal{O}(C\log\log T)$ by Gupta et al. [2025]. This leaves as an open problem to ``decouple'' the dependence on $C$ and $T$. In this work, we resolve this open problem. In particular, we develop a robust variant of binary search that achieves regret $\mathcal{O}(C+\log T)$ when the corruption $C$ is known and $\mathcal{O}(C+\log^2 T)$ when the corruption is unknown.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript develops a robust variant of binary search for the dynamic pricing problem with adversarial corruptions to the binary feedback. It achieves regret bounds of O(C + log T) when the corruption level C is known and O(C + log² T) when C is unknown. This resolves the open problem of decoupling the regret dependence on the corruption budget C and the time horizon T, improving on the prior O(C log log T) bound from Gupta et al. [2025]. The setting assumes a fixed unknown buyer valuation v*, unlimited supply, and at most C corruptions to the binary purchase observations.
Significance. If the claimed bounds hold, this work is significant because it provides the first regret guarantees that separate the additive corruption cost from the logarithmic search cost in robust dynamic pricing. The explicit algorithmic construction under standard assumptions (fixed v*, limited corruptions) closes the gap left by prior work and is likely tight up to constants given the information-theoretic lower bound of Ω(C + log T). The separation into known-C and unknown-C regimes demonstrates careful design that advances robust online learning in revenue management.
minor comments (3)
- The citation 'Gupta et al. [2025]' in the abstract and introduction should include the full bibliographic entry in the references section for completeness and verifiability.
- A short discussion or reference to the matching information-theoretic lower bound Ω(C + log T) in the introduction would better contextualize the optimality of the achieved upper bounds.
- Including pseudocode for the robust binary search procedure (both known-C and unknown-C variants) in the algorithm section would improve clarity and aid reproducibility of the construction.
Simulated Author's Rebuttal
We thank the referee for their positive summary of our work, recognition of its significance in resolving the open problem of decoupling corruption and time-horizon dependence in robust dynamic pricing, and recommendation for minor revision. No specific major comments were raised in the report.
Circularity Check
No significant circularity; algorithmic construction is self-contained
full rationale
The paper resolves the open problem via an explicit algorithmic construction: a robust variant of binary search for dynamic pricing under at most C adversarial corruptions to binary feedback. The claimed regret bounds O(C + log T) (known C) and O(C + log² T) (unknown C) follow from standard elimination analysis augmented with repetition or majority voting to absorb the additive C cost. No load-bearing step reduces by definition to its inputs, renames a fitted parameter as a prediction, or relies on a self-citation chain whose cited result is itself unverified. The derivation is independent of the target bounds and externally falsifiable via the stated assumptions on fixed v*, unlimited supply, and bounded corruptions.
Axiom & Free-Parameter Ledger
axioms (2)
- domain assumption Buyer's valuation v* is fixed and unknown across rounds
- domain assumption Adversary corrupts at most C binary feedbacks
Lean theorems connected to this paper
-
IndisputableMonolith/Cost/FunctionalEquation.leanwashburn_uniqueness_aczel unclear?
unclearRelation between the paper passage and the cited Recognition theorem.
We develop a robust variant of binary search that achieves regret O(C+log T) when the corruption C is known and O(C+log² T) when the corruption is unknown.
-
IndisputableMonolith/Foundation/AbsoluteFloorClosure.leanabsolute_floor_iff_bare_distinguishability unclear?
unclearRelation between the paper passage and the cited Recognition theorem.
We employ a potential function argument to prove that the number of 'wrong steps' ... is bounded linearly in the corruption C.
What do these tags mean?
- matches
- The paper's claim is directly supported by a theorem in the formal canon.
- supports
- The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
- extends
- The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
- uses
- The paper appears to rely on the theorem as machinery.
- contradicts
- The paper's claim conflicts with a theorem or certificate in the canon.
- unclear
- Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.
Reference graph
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discussion (0)
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