3,707 research outputs found
The Grothendieck--Teichmüller group of~PSL(2,q)
No full textInternational audienceWe show that the Grothendieck-Teichmüller group of PSL(2, q), or more precisely the group GT 1 (PSL(2, q)) as previously defined by the author, is the product of an elementary abelian 2-group and several copies of the dihedral group of order 8. Moreover, when q is even, we show that it is trivial. We explain how it follows that the moduli field of any "dessin d'enfant" whose monodromy group is PSL(2, q) has derived length ≤ 3
Identification of Public Service Logic (PSL) and Public Service Motivation (PSM) elements in Open Government Data (OGD) initiatives
No full textWhile previous research on Open Government Data (OGD) has primarily focused on reuse and adoption, this study aims to explore the implications of the Public Service Logic (PSL) and Public Service Motivation (PSM) dimensions in the context of OGD initiatives. This study is contextualized in Tanzania wherein the OGD initiatives are at an evolving stage. For the present study, the perspectives of the 15 public officials involved in the management of the OGD initiatives are being solicited. Findings underscore the need for furthering the marketing and refurbishing the OGD initiatives' quality alongside the increased involvement of the stakeholders to engage in value co-creation. Furthermore, as a study contextualized in a developing country to understand the involvement of the public personnel in the refurbishment of the OGD initiatives, the study contributes to the extant OGD literature while identifying the OGD publisher-side challenges and strengths in a still-evolving OGD initiative. Finally, with its societal implications in terms of the impact on societal stakeholders' engagement with OGD given the PSL-PSM of the public officials, the study's relevance is also clinched.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Information and Communication Technolog
The Grothendieck--Teichm\"{u}ller group of~PSL(2,<i>q</i>)
No full textAbstract
In this paper, we show that the Grothendieck–Teichmüller group of
PSL
(
2
,
q
)
{\operatorname{PSL}(2,q)}
, or more precisely the group
𝒢
𝒯
1
(
PSL
(
2
,
q
)
)
{\mathcal{G\kern-0.569055ptT}_{\kern-1.707165pt1}(\operatorname{PSL}(2,q))}
as previously defined by the author, is the product of an elementary abelian 2-group and several copies of the dihedral group of order 8. Moreover, when q is even, we show that it is trivial. We explain how it follows that the moduli field of any “dessin d’enfant” whose monodromy group is
PSL
(
2
,
q
)
{\operatorname{PSL}(2,q)}
has derived length
≤
3
{\leq 3}
.
This paper can serve as an introduction to the general results on the Grothendieck–Teichmüller group of finite groups obtained by the author.</jats:p
from BRST reductions, associated varieties and nilpotent orbits
No full textWe verify a conjecture of Beem and the first author stating that a certain family of physically motivated BRST reductions of beta-gamma systems and free fermions is isomorphic to , and that its associated variety is isomorphic as a Poisson variety to the minimal nilpotent orbit closure . This shows in particular that is quasi-lisse. Combining this with other results in the literature (in particular work of Ballin et al.), this paper provides a concrete and important example of how one can extract two symplectic dual varieties from a rather well-known vertex operator algebra
from BRST reductions, associated varieties and nilpotent orbits
No full textWe verify a conjecture of Beem and the first author stating that a certain family of physically motivated BRST reductions of beta-gamma systems and free fermions is isomorphic to , and that its associated variety is isomorphic as a Poisson variety to the minimal nilpotent orbit closure . This shows in particular that is quasi-lisse. Combining this with other results in the literature (in particular work of Ballin et al.), this paper provides a concrete and important example of how one can extract two symplectic dual varieties from a rather well-known vertex operator algebra
The Inductive Blockwise Alperin Weight Condition for PSL (3; q)
No full textThe blockwise Alperin weight conjecture assets that for any finite group G and any prime l, the number of the Brauer characters in an l-block B equals the number of the G-conjugacy classes of l-weights belonging to B. Recently, the inductive blockwise Alperin weight condition has been introduced such that the blockwise Alperin weight conjecture holds if all non-abelian simple groups satisfy these conditions. We will verify the inductive blockwise Alperin weight condition for the finite simple groups PSL(3; q) in this paper. 2010 Mathematics Subject Classification : 20C20, 20C33NSFC [11631001]SCI(E)中国科学引文数据库(CSCD)ARTICLE1123-1522
PSL Research University: What does a university look like?
No full textPSL Research University
About the Researchers
The network above represents a connected graph of 1,394 co-authored researchers affiliated to the PSL Research University from 2017-2022, making up 21% of all affiliated researchers over this time period. Each researcher has been colour coded by the 2-digit FoR 2020 code they are most associated with. Each researcher is depicted by a sphere, and given a size based on the number of publications produced.
About the Clusters
3 research clusters were identified in the network above. To make the network easier to read, collaborations between clusters are not displayed, although they do play a significant role in the layout of the network. Clusters of 20 or more researchers can be explored further in the associated figshare record (linked in the QR code top right of legend). Clusters are colour coded by the most dominant discipline of the researchers within them, and are given a ‘height' based on the discipline that they proportionally belong to. Biomedical and Clinical Sciences clusters sit at the base of the network, with Language, Communication and Culture sitting at the top.
About the Classifications
The 2020 Field of Research codes used in this analysis have been assigned to publications using the approach detailed in “Recategorising research: Mapping from FoR 2008 to FoR 2020 in Dimensions” (https://doi.org/10.1162/qss_a_00244.) Note: some research areas are not well represented in the network due to single author publications.
Fields of Research with greater than 50% of their output not represented in the network include: Biomedical and Clinical Sciences (53.94%), Health Sciences (76.32%), Biological Sciences (82.41%), Chemical Sciences (96.04%), Information and Computing Sciences (96.2%), Physical Sciences (98.21%), Psychology (98.63%), and Engineering (98.86%)
Methodology:
Graph layout: Batchlayout [1]
Clustering: Leiden Algorithm [2]
3d Layout: Blender [3]
Data: Dimensions [4]</p
Free flow speed estimation: A probabilistic, latent approach. Impact of speed limit changes and road characteristics
No full textThe estimation of the free flow speed (FFS) distribution is important for capacity analysis, determination of the level-of-service, and setting speed limits. Subjective time headway thresholds have been commonly used to identify vehicles travelling under free flow speed conditions i.e., vehicles whose speeds are not influenced by the vehicle in front. Since, the headway a driver operates under the free flow state is subjective and varies from driver to driver, such approaches can introduce biases in the FFS estimation. Therefore, in this paper a parametric probabilistic latent approach is proposed based on discrete choice utility theory to estimate the FFS distribution on urban roads and simultaneously the probability that drivers perceive their state as constrained by the vehicle in front. This methodology is used to estimate the impacts of road characteristics and Posted Speed Limit (PSL) changes on the FFS distribution using an extensive dataset of speed observations from urban roads with varying characteristics. The results show that the simultaneous estimation of the free flow speed distribution and the state the driver is in (e.g., free or constrained) is feasible. The analysis indicates that the FFS is influenced by several road characteristics such as land use, on-street parking and the presence of sidewalks. The PSL change impacts not only the distribution of the free flow vehicles but also the speed distribution of the constrained vehicles. The constrained probabilities vary depending on the PSL change with higher probabilities for lower speed limits.Accepted Author ManuscriptTransport and Plannin
Finiteness of mapping degrees and PSL(2, R)-volume on graph manifolds
No full textFor given closed orientable 3-manifolds M and N let D(M, N) be the set of mapping degrees from M to N. We address the problem: For which N is D(M, N) finite for all M ? The answer is known for prime 3-manifolds unless the target is a nontrivial graph manifold. We prove that for each closed nontrivial graph manifold N, D(M, N) is finite for any graph manifold M. The proof uses a recently developed standard form of maps between graph manifolds and the estimation of the (PSL) over tilde (2, R)-volume for a certain class of graph manifolds.MathematicsSCI(E)2ARTICLE31727-1749
John Rodker, Revising Author and Revised Translator
No full textInternational audienceAs a translated author, modernist poet, and publisher, John Rodker carried on a correspondence with his French translator, Ludmila Savitzky, which shows how carefully he answered her questions about syntax and word choice. As a translator, Rodker was in touch with famous French writers whom he was translating, including Henry de Montherlant who was asked to revise Rodker’s translation drafts for three bestselling novels. Such epistolary exchanges between authors and translators illuminate their method and the rhythm of their work, their proficiency in foreign languages, and their more-or-less open-ended translational suppleness at a crucial – though usually invisible – stage of the translation. Archival documents such as first drafts, revised typescripts, and author–translator correspondences speak to how collaborative translation will often take on a hermeneutic dimension that elucidates the source text, the target text, and the act of translation itself
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