Negative / Null Result ReportOpen accessComputer Science
Adrien Boiret, Radosław Piórkowski, Janusz Schmude · 2018 · arXiv
In the past decades, classical results from algebra, including Hilbert's Basis Theorem, had various applications in formal languages, including a proof of the Ehrenfeucht Conjecture, decidability of HDT0L sequence equivalence, and decidability of the equivalence problem for functional tree-to-string transducers. In this paper, we study the scope of the algebraic methods mentioned above, particularily as applied to the equivalence problem for register automata. We provide two results, one positive, one negative. The positive result is that equivalence is decidable for MSO transformations on uno
Negative / Null Result ReportOpen accessMedicine
Amate A, Lieberman M · 2026 · Harm reduction journal
Medetomidine has recently emerged in the illicit drug supply in the United States, and lateral flow immunoassay test strips are an inexpensive and easy-to-use field screening option for detecting this highly potent sedative. However, the…
View details →DOI: 10.1186/s12954-025-01387-6 Negative / Null Result ReportOpen accessComputer Science
S. Albeverio, H. Gottschalk, J. -L. Wu · 2004 · arXiv
We construct Euclidean random fields $X$ over $\R^d$, by convoluting generalized white noise $F$ with some integral kernels $G$, as $X=G* F$. We study properties of Schwinger (or moment) functions of $X$. In particular, we give a general equivalent formulation of the cluster property in terms of truncated Schwinger functions which we then apply to the above fields. We present a partial negative result on the reflection positivity of convoluted generalized white noise. Furthermore, by representing the kernels $G_\a$ of the pseudo--differential operators $(-\D + m^2_0)^{-α}$ for $α\in (0,1)$ and
Negative / Null Result ReportOpen accessEconomics, Econometrics and Finance
Yechan Park, Yuya Sasaki · 2024 · arXiv
This paper addresses the challenge of estimating the Average Treatment Effect on the Treated Survivors (ATETS; Vikstrom et al., 2018) in the absence of long-term experimental data, utilizing available long-term observational data instead. We establish two theoretical results. First, it is impossible to obtain informative bounds for the ATETS with no model restriction and no auxiliary data. Second, to overturn this negative result, we explore as a promising avenue the recent econometric developments in combining experimental and observational data (e.g., Athey et al., 2020, 2019); we indeed fin
Negative / Null Result ReportOpen accessComputer Science
Tian-Fu Chen, Jie-Hong R. Jiang · 2024 · arXiv
Boolean matching is an important problem in logic synthesis and verification. Despite being well-studied for conventional Boolean circuits, its treatment for reversible logic circuits remains largely, if not completely, missing. This work provides the first such study. Given two (black-box) reversible logic circuits that are promised to be matchable, we check their equivalences under various input/output negation and permutation conditions subject to the availability/unavailability of their inverse circuits. Notably, among other results, we show that the equivalence up to input negation and pe
Negative / Null Result ReportOpen accessComputer Science
Michael Bekos, Stephen Kobourov, Michael Kaufmann et al. · 2014 · arXiv
Given an $n$-vertex graph $G$ and two positive integers $d,k \in \mathbb{N}$, the ($d,kn$)-differential coloring problem asks for a coloring of the vertices of $G$ (if one exists) with distinct numbers from 1 to $kn$ (treated as \emph{colors}), such that the minimum difference between the two colors of any adjacent vertices is at least $d$. While it was known that the problem of determining whether a general graph is ($2,n$)-differential colorable is NP-complete, our main contribution is a complete characterization of bipartite, planar and outerplanar graphs that admit ($2,kn$)-differential co
Negative / Null Result ReportOpen accessMathematics
Tobias Fissler, Yannick Hoga · 2024 · arXiv
This paper lays out a principled approach to compare copula forecasts via strictly consistent scores. We first establish the negative result that, in general, copulas fail to be elicitable, implying that copula predictions cannot sensibly be compared on their own. A notable exception is on Fréchet classes, that is, when the marginal distribution structure is given and fixed, in which case we give suitable scores for the copula forecast comparison. As a remedy for the general non-elicitability of copulas, we establish novel multi-objective scores for copula forecast along with marginal forecast
Negative / Null Result ReportOpen accessComputer Science
Vidya Muthukumar, Soham Phade, Anant Sahai · 2020 · arXiv
We study the limiting behavior of the mixed strategies that result from optimal no-regret learning strategies in a repeated game setting where the stage game is any 2 by 2 competitive game. We consider optimal no-regret algorithms that are mean-based and monotonic in their argument. We show that for any such algorithm, the limiting mixed strategies of the players cannot converge almost surely to any Nash equilibrium. This negative result is also shown to hold under a broad relaxation of these assumptions, including popular variants of Online-Mirror-Descent with optimism and/or adaptive step-si
Negative / Null Result Report
Kirill Zhirkov, Robert H. Brehm · 2025 · Research & Politics
Activists and politicians often express a belief that the language used to describe immigrant populations, such as “illegal” vs. “undocumented,” can impact policy opinions. Existing experimental studies, however, have found relatively…
View details →DOI: 10.1177/20531680251355233 Negative / Null Result ReportOpen accessComputer Science
Shrikant Utagi, Subhashish Banerjee, R. Srikanth · 2022 · arXiv
The eternally non-Markovian Pauli channel is an example of a unital channel characterized by a negative decay rate for all time $t>0$. Here we consider the problem of constructing an analogous non-unital channel, and show in particular that a $d$-dimensional generalized amplitude damping (GAD) channel cannot be eternally non-Markovian when the non-Markovianity originates solely from the non-unital part of the channel. We study specific ramifications of this result for qubit GAD. Specifically, we construct a quasi-eternally non-Markovian qubit GAD channel, characterized by a time $t^\ast > 0$,
Negative / Null Result ReportOpen accessComputer Science
Rickmer Schulte, David Rügamer · 2026 · arXiv
The analysis of neural representation has become an integral part of research aiming to better understand the inner workings of neural networks. While there are many different approaches to investigate neural representations, an important line of research has focused on doing so through the lens of intrinsic dimensions (IDs). Although this perspective has provided valuable insights and stimulated substantial follow-up research, important limitations of this approach have remained largely unaddressed. In this paper, we highlight a crucial discrepancy between theory and practice of IDs in neural
Negative / Null Result ReportOpen accessComputer Science
Metin Gurses, Tahsin Cagri Sisman, Bayram Tekin · 2023 · arXiv
We are interested in the charged dust solutions of the Einstein field equations in stationary and axially symmetric spacetimes; and inquire if the naked singularities of the Israel-Wilson-Perjes (IWP) metrics can be removed. The answer is negative in four dimensions. We examine whether this negative result can be avoided by adding scalar or dilaton fields. We show that IWP metrics also arise as solutions of the Einstein-Maxwell system with a stealth dilaton field. We determine the IWP metrics completely in terms of one complex function satisfying the Laplace equation. With the inclusion of the
Negative / Null Result ReportOpen accessComputer Science
MaryBeth Defrance, Tijl De Bie · 2023 · arXiv
Fairness in AI has garnered quite some attention in research, and increasingly also in society. The so-called "Impossibility Theorem" has been one of the more striking research results with both theoretical and practical consequences, as it states that satisfying a certain combination of fairness measures is impossible. To date, this negative result has not yet been complemented with a positive one: a characterization of which combinations of fairness notions are possible. This work aims to fill this gap by identifying maximal sets of commonly used fairness measures that can be simultaneously
Negative / Null Result ReportOpen accessComputer Science
Stephanie Schoch, Yangfeng Ji · 2025 · arXiv
Prior works have shown that in-context learning is brittle to presentation factors such as the order, number, and choice of selected examples. However, ablation-based guidance on selecting the number of examples may ignore the interplay between different presentation factors. In this work we develop a Monte Carlo sampling-based method to study the impact of number of examples while explicitly accounting for effects from order and selected examples. We find that previous guidance on how many in-context examples to select does not always generalize across different sets of selected examples and
Negative / Null Result ReportOpen accessComputer Science
Mohammed Barhoush, Tomoyuki Morimae, Ryo Nishimaki et al. · 2026 · arXiv
Mahadev [SIAM J. Comput. 2022] introduced the first protocol for classical verification of quantum computation based on the Learning-with-Errors (LWE) assumption, achieving a 4-message interactive scheme. This breakthrough naturally raised the question of whether fewer messages are possible in the plain model. Despite its importance, this question has remained unresolved. In this work, we prove that there is no quantum black-box reduction of non-interactive classical verification of quantum computation of $\textsf{QMA}$ to any falsifiable assumption. Here, "non-interactive" means that after an
Negative / Null Result ReportOpen accessComputer Science
Kai Kim, Howard Tsai, Rajat Sen et al. · 2024 · arXiv
Current forecasting approaches are largely unimodal and ignore the rich textual data that often accompany the time series due to lack of well-curated multimodal benchmark dataset. In this work, we develop TimeText Corpus (TTC), a carefully curated, time-aligned text and time dataset for multimodal forecasting. Our dataset is composed of sequences of numbers and text aligned to timestamps, and includes data from two different domains: climate science and healthcare. Our data is a significant contribution to the rare selection of available multimodal datasets. We also propose the Hybrid Multi-Mo
Negative / Null Result ReportOpen accessMathematics
Francisco Javier Gallego, Miguel Gonzalez, Bangere P. Purnaprajna · 2015 · arXiv
In this paper, we show that if $X$ is a smooth variety of general type of dimension $m \geq 2$, for which its canonical map induces a double cover onto $Y$, where $Y$ is a projective bundle over $\mathbf P^1$, or onto a projective space or onto a quadric hypersurface, embedded by a complete linear series, then the general deformation of the canonical morphism of $X$ again is canonical and again induces a double cover. The second part of the article deals with the existence or non existence of canonical double structures on rational varieties. The negative result in this article has consequence
Negative / Null Result ReportOpen accessComputer Science
Luiz Carlos Ryff · 2010 · arXiv
It follows from Bell's theorem and quantum mechanics that the detection of a particle of an entangled pair can (somehow) "force" the other distant particle of the pair into a well-defined state (which is equivalente to a reduction of the state vector): no property previously shared by the particles can explain the predicted correlations. This result has been corroborated by experiment. However, it has not been experimantally proved-and it is far from obvious-that the absence of detection, as in null-result (NR) experiments could have the very same effect. In this paper a way to try to bridge t
Negative / Null Result Report
Ibrahima Diallo · 2024 · Journal for Translation Studies in Africa
The article contians a summary review of literature on the language question in Sub-Saharan Africa in order to understand what strategies were proposed for the promotion of African languages and what resulsts were achieved after half a…
View details →DOI: 10.38140/jtsa.v6i.8337 Negative / Null Result Report
Comfort Pratt · 2024 · Journal of Language Teaching
Student attrition rates in K-12 and college Spanish programs in the United States continue to follow a disconcerting trend. While motivational and pedagogical interventions have been investigated, the student–teacher dynamic has not been…
View details →DOI: 10.54475/jlt.2024.003 Negative / Null Result Report
Laura Wilson, null null, null null et al. · 2016 · John Heinrichs Scholarly & Creative Activities Day
Protostega gigas was a large sea turtle that lived in the Late Cretaceous Western Interior Seaway of North America. Protostega fossils are found in the Smoky Hill Member of the Niobrara Formation in Kansas. Despite their abundance, little…
View details →DOI: 10.58809/nztu8717 Negative / Null Result Report
Westin Mash, null null, null null et al. · 2023 · John Heinrichs Scholarly & Creative Activities Day
The objective of this research project is to investigate data from the 2021 BattleBots season, play-in, and championship matches to see if any variables have a statistically significant contribution to how many wins a bot achieves. A…
View details →DOI: 10.58809/freg1477 Negative / Null Result Report
David Schulte, null null, null null et al. · 2023 · John Heinrichs Scholarly & Creative Activities Day
This project studies the economic perceptions and expectations (P&E) held by FHSU students, since these helps determine a student’s choice of major, student-loan balance, and post-graduation plans. The study is a continuation of a…
View details →DOI: 10.58809/ypio8354 Negative / Null Result Report
Coy Lampe, null null, null null et al. · 2023 · John Heinrichs Scholarly & Creative Activities Day
M1 money is defined by the Federal Reserve as money in circulation as well as money in demand deposit accounts such as a checking account. The Fed, as it is commonly referred to as, uses this figure to target interest rates in the economy.…
View details →DOI: 10.58809/tgdc8343 Negative / Null Result Report
Melissa Barron, null null, null null et al. · 2023 · John Heinrichs Scholarly & Creative Activities Day
Today breastfeeding (BF) is often widely promoted in healthcare settings; however, truly little preparation is provided to women. Studies have also shown many health benefits to women and children, leading to a positive economic effect…
View details →DOI: 10.58809/hrro6336 Negative / Null Result Report
Mia Jang, null null, null null et al. · 2020 · John Heinrichs Scholarly & Creative Activities Day
Since yeasts have the most similar way of doing its cellular respiration to humans, we were interested in investigating if yeasts could survive in the Mars-like environment. Preparing for the future life, we thought that if yeast could…
View details →DOI: 10.58809/dqjj2407 Negative / Null Result Report
Daniel Huantes, null null, null null et al. · 2023 · John Heinrichs Scholarly & Creative Activities Day
Chromatic aberration in the eye causes differences in the retinal spot size for different wavelengths of light. This work explores the limiting effect of retinal spot size for wavelengths around 590nm, and implements python code to attempt…
View details →DOI: 10.58809/neqf4878 Negative / Null Result Report
Katy Barbieri, null null, null null et al. · 2023 · John Heinrichs Scholarly & Creative Activities Day
Ineffective communication among healthcare professionals can result in a decrease in patient safety. It is a leading cause of medical errors and poor patient outcomes. This can be due to the complexity and pace of the interactions,…
View details →DOI: 10.58809/nqpd5215 Negative / Null Result Report
Laura Wilson, null null, null null et al. · 2018 · John Heinrichs Scholarly & Creative Activities Day
In modern marine ecosystems, seabirds are considered indicators of ecological hotspots because their biogeographic distribution is correlated with physical, chemical, and biological oceanographic factors. Pursuit diving seabirds – those…
View details →DOI: 10.58809/hwmy7788 Negative / Null Result Report
Brendon McCampbell, null null, null null et al. · 2016 · John Heinrichs Scholarly & Creative Activities Day
FHSU students and faculty are committed to addressing food insecurity issues faced by students, faculty and staff. In 2011, the FHSU Victor E. Garden was created to provide greater access to fresh produce for the campus community. In 2012,…
View details →DOI: 10.58809/qwia4560 