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All papers published in this volume have been reviewed through processes administered by the Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing.• Type of peer review: Double Anonymous• Conference submission management system: Morressier• Number of submissions received: 86• Number of submissions sent for review: 86• Number of submissions accepted: 30• Acceptance Rate (Submissions Accepted / Submissions Received × 100): 35%• Average number of reviews per paper: 1.00• Total number of reviewers involved: 42• Contact person for queries:Name: Linda YeAffiliation: The International Society for Applied Computing (ISAC)Email: linda.ye@applied-computing.net

We introduce and study the bounded word problem and the precise word problem for groups given by means of generators and defining relations. For example, for every finitely presented group, the bounded word problem is in

Abstract We introduce an improvement to the FxFx matrix element merging procedure for pp → t t ¯ W tt̅W production at NLO in QCD with one and/or two additional jets. The main modification is an improved treatment of jets that are not logarithmically enhanced in the low transverse-momentum regime. We provide predictions for the inclusive cross section and the t t ¯ W tt̅W differential distributions including parton-shower effects. Taking also the NLO EW corrections into account, this results in the most-accurate predictions for this process to date. We further proceed to include the on-shell LO decays of the t t ¯ W tt̅W including the tree-level spin correlations within the narrow-width approximation, focusing on the multi-lepton signatures studied at the LHC. We find a ∼30% increase over the NLO QCD prediction and large non-flat K-factors to differential distributions.

All papers published in this volume of Journal of Physics: Conference Series have been peer reviewed through processes administered by the Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing. Type of peer review: Double-blind. Neither authors nor reviewers know each other’s names. • Conference submission management system: CMT • Number of submissions received: 80 • Number of submissions sent for review: 80 • Number of submissions accepted:41 • Acceptance Rate (Number of Submissions Accepted / Number of Submissions Received X 100):51% • Average number of reviews per paper: 1-2 • Total number of reviewers involved:50 • Any additional info on review process: Contact person for queries: Linda Ye, The International Society for Applied Computing (ISAC), linda.ye@applied-computing.net

Peer review is the driving force of journal development, and reviewers are gatekeepers who ensure that Computation maintains its standards for the high quality of its published papers. Thanks to the cooperation of our reviewers, in 2020, the median time to first decision was 17 days and the median time to publication was 39 days. Abdelhamed, Waleed Mendonça, José Ricardo G. Abramovich, Haim Menéndez, Héctor D. Ahmad Taher Azar, Azar Messa, Gianandrea Vittorio Akkermans, Rinie Mewomo, Oluwatosin T. Alejski, Krzysztof Meyer, João F. C. A. Ali, Farman Michal, Malček Alshomrani, Ali Saleh Migallón, Héctor Amovilli, Claudio Mirjalili, Seyedali Anastassi, Zacharias A. Mitkowski, Piotr Anderson, Johan Mitra, Gaurav Angrecka, Sabina Modenutti, Carlos Anochi, Juliana Mohamed, Ali Wagdy Arnal, Josep Mohapatra, Sarat Arrabito, Giuseppe Domenico Molla, Mamun Arteta, Alberto Monné, Magnus Asadzadeh, Mohammad Zhian Montefusco, Eugenio Asai, Asaithambi Mosavi, Amir Aslam, Sheraz Moysis, Lazaros Ateeq-ur-Rehman, Sardar Mozaffari, Saeed Bača, Miroslav Mueller, Niklaus H. Bach, Mirjana Pejic Muhammad, Nazeer Badsha, Shahriar Muralidharan, Balaji Barisano, Donatella Murino, Teresa Bariviera, Aurelio Fernandez Narayanan, Barath Batagin-Neto, Augusto Nawani, Pranav Benslimane, Sidi Mohammed Neilsen, Mitchell L. Bergamaschi, Luca Neumann, Philipp Biscarini, Chiara Ngo, Son I. Blaisten-Barojas, Estela Nooraiepour, Mohammad Boghi, Andrea Ntaikou, Ioanna Bonanno, Claudio Ovgun, Ali Brandbyge, Mads Panangadan, Anand Brehm, Martin Pantazis, Dimitrios A. Bretti, Gabriella Park, Choonkil Bugiotti, Francesca Park, Won Kwang Bui, Ngoc-Tam Pasinszki, Tibor Burdett, Robert Patra, Braja Gopal Cabaleiro, David Pelinovsky, Efim Camacho-Conde, Jose Antonio Perc, Matjaz Campos Souza, Paulo Vitor Pérez-Delgado, María-Luisa Camposo Pereira, Artur Peszynska, Malgorzata Cantrak, Djordje Pietrowski, Wojciech Carp, Mihai Pimenidis, Elias Cavasotto, Claudio N. Pin, Paolo Ceron-Carrasco, Jose Pinheiro, Plácido Cesarano, Clemente Pinto, Gustavo Filipe Ceulemans, Arnout Pleiter, Dirk Chandar, Dominic Poklonsky, Alexander Chang, Xinghua Polap, Dawid Chasalevris, Athanasios Posada-Quintero, Hugo F. Chauhan, Vedang Dilipkumar Pour, Mohsen Saffari Chen, Duan Praks, Pavel Chen, Yiming Prudkovskiy, Vladimir S. Cheng, Yongguang Pugliese, Luigi Cho, Sun Young Qiao, Chen Choiński, Dariusz Quiroz-Juárez, Mario A. Civalek, Ömer Radenovic, Stojan Cleaver, Gerald Rahimi-Gorji, Mohammad Coelho, Vitor N. Rahimzadeh, Iman Coussens, Scott Rahmani, Farzin Dai, Jiguo Raiteri, Paolo Damasevicius, Robertas Raj, Nawin David, Oana Ranstam, Jonas De Carvalho-Junior, Francisco H. Rasuo, Bosko De La Sen, Manuel Rau, Henrike Delnevo, Giovanni Raucci, Umberto Dentale, Fabio Ribeiro, Ricardo Denzumi, Shuhei Rinaldi, Giovanni Devidson, Sergio Roccetti, Marco Dexter, Alexander Rodrigues, José Alberto Di Ilio, Giovanni Rodrigues, Simão Dogaru, Vasile Rogowski, Krzysztof Dominguez-Isidro, Saul Rossi, Andreina Druetta, Pablo Rudemo, Mats Duffey, Romney B. Rudshteyn, Benjamin Dzedzej, Zdzisław Rugh, Hans Henrik Elaiw, Ahmed M. Rusu, Eugen Eremin, Alexey S. Saad, Khaled M. Eshraghi, Shaun Sacco, Riccardo Fajín, José L. C. Saha, Biswajit Falk, Abram L. Sajavičius, Svajūnas Fiestras-Janeiro, Maria Gloria Sałabun, Wojciech Fiore, Silvia Salas-Morera, Lorenzo Frigau, Luca Salimi, Mehdi Fu, Chen Salvati, Luca Fu, Guopeng Sánchez Rodríguez, Luis Fukui, Ken-ichi Sánchez, María Teresa Gale, Carmen Sánchez-Torres, Juan Diego Garcia, Gregorio Bernabe Sanders, Peter Garcia-Constantino, Matias Sankaranarayanan, Nehru Viji Garcia-Gasulla, Marta Saseendran, Vishnu García-Ordás, María Teresa Sauer, Nathalie Geletii, Yurii Savaidis, Georgios Georgieva, Atanaska Sawerwain, Marek Gheorghe, Marian Scarinci, Teresa Gheorghiu, Calin-Ioan Schulz, Volker Paul Ghosh, Swarnava Senturk, Utku Giampietro, Letizia Sepúlveda, Mauricio Gilja, Gordon Severino, Alessandro Gill, Sukhpal Singh Sgouros, Aristotelis Giuliano, Aristide Shafique, Umar Gladkov, Sergey Shah, Zahir Glushkov, Alexander V. Shao, Sihong Goli, Preetham Sharma, Gokarna Golovnin, Oleg K. Shatanawi, Wasfi Gomha, Sobhi Shaw, Harry González-Gaxiola, Oswaldo Shehab, Wesam S. Gosselin, Ryan Sheikholeslami, Mohsen Grysa, Krzysztof Shen, Cong Hameed, Nazia Shrivastava, Indira Hammad, Mohamed Adel Siami-Namini, Sima Hassan, Saeed U. Simon-Chane, Camille He, Guanjie Smetuch, Nadin Heinlein, Alexander Snead, Lance Hemmati, Arman Soler, Jaime Hernik, Bartłomiej Soltani, Madjid Holik, Federico Song, Juyoung Hong, Tao Song, Tao Horák, Jakub Sonnino, Giorgio Howlin, Brendan Spyridonos, Panagiota Hsiao, Kai-Long Sreckovic, Vladimir A. Hsin, Kun-Yi Stanciu, Loredana Huang, Haiping Stehlík, Milan Huang, Yuli Strout, Douglas L. Hulman, Martin Strzelecki, Michał Igual, Jorge Su, Ching-liang Ikegaya, Naoki Subramanian, Karthikeyan Imai, Yasutaka Suo, Shuangfu Imam, Tasadduq Syed, Mujahid N. Inglese, Paolo Szeidert, Iosif Isidori, Daniela Szewczyk, Roman Ivančević, Darko Talbot, Denis Jackson, Mark Tang, Chaolong Jafari, Roy Tang, Xuelin Jakšić, Olga Tavelli, Maurizio Jameel, Shoaib Teimourian, Amir Jawab, Fouad Temuer, Chaolu Jia, Zhe Teng, Kah Hou Johonpillai, Andrew Gratien Tenreiro, Claudio Jradi, Walid Abdala Rfaei Testani, Claudio Kącka-Zych, Agnieszka Tomášková, Hana Kadijevich, Djordje M. Tonetti, Lorenzo Kapranov, Sergey Tong, Xin T. Karapınar, Erdal Torabi, Mohsen Karimov, Artur Tridane, Abdessamad Kavousanakis, Mihalis Tronci, Stefania Kaya, Savas Tsushima, Natsuki Keleshteri, Mohammad M. Tyrologou, Pavlos Keshwani, Deepak Tyutyunov, Yuri Khaki, Saeed Uruba, Václav Khan, Muhammad Altaf Vahab, Mohammad Khan, Yasir Vakhania, Nodari Khanh Le, Nguyen Quoc Varotsos, Panayiotis A. Khodadadian, Amirreza Vassilakis, Costas Khokhlov, Nikolay Vener, Mikhail V. Klimach, Harald Venkatraman, Sitalakshmi Komarov, Pavel V. Vergara, Diego Kong, Fande Verkhovtsev, Alexey Konopka, Stanisław Vlase, Sorin Konuralp, Ali Vlasiou, Manos Kordov, Krasimir Vulkov, Lubin G. Kouznetsova, Valentina Vulpe, Alexandru Kovács, Sándor Walker, A. Duncan Kumar, Sunil Wang, Hao Kumavor, Patrick D. Wang, Yi-Hsien Kuś, Marek Wang, Yinzhi Kyoungsik, Chang Wei, Zhouchao Labus, Aleksandra Weichbroth, Paweł Lahoz, Rafael Wilson, Michael Laín, Santiago Wright, Steven A. Lanconelli, Alberto Wu, Panruo Lardeau, Sylvain Wu, Xin-Ping Le, Jian Xu, Chao Ledesma, Ana Estela Xu, Yunhong Lee, Jaegeun Yang, Xusan Lee, Kuo Hao Yaraki, Mohammad Tavakkoli Leiss, Ernst Yemelyanov, Vitaliy A. Leister, Wolfgang Yu, Wenbin Leiviskä, Kauko Zelator, Konstantine Leonowicz, Zbigniew Zelepuga, Elena Li, Wei Zentkova, Maria Li, Wuchen Zhang, Haochun Liang, Kun Zhang, Lei Licina, Dusan Zhang, Liuyang Lim, Kian Meng Zhang, Tonghua Liu, Hui Zhang, Xuyang Mahajan, Sachit Zhao, Mingfei Małecki, Krzysztof Zhao, Xizeng Mallet, Dann Zheng, Fei Marchisio, Alberto Zhu, Congxu Marsalek, Ondrej Zhu, Yunpeng Marszałł, Michał Piotr Zia, Muhammad Yousuf Irfan Mehmood, Rashid Computation Editorial Office MDPI AG, St. Alban-Anlage 66, 4052 Basel, Switzerland

This volume contains the proceedings of the virtual workshop on Computational Aspects of Discrete Subgroups of Lie Groups, held from June 14 to June 18, 2021, and hosted by the Institute for Computational and Experimental Research in Mathematics (ICERM), Providence, Rhode Island.The major theme deals with a novel domain of computational algebra: the design, implementation, and application of algorithms based on matrix representation of groups and their geometric properties. It is centered on computing with discrete subgroups of Lie groups, which impacts many different areas of mathematics such as algebra, geometry, topology, and number theory. The workshop aimed to synergize independent strands in the area of computing with discrete subgroups of Lie groups, to facilitate solution of theoretical problems by means of recent advances in computational algebra.

Children and infants of different age and weight respond differently to drugs. Special care is needed in the calculation of drug doses to reduce and prevent the risk of toxicity. The 2011 Advanced Paediatric Life Support (APLS) guideline, 5th edition, includes an updated method for weight estimation for emergency situations[1]. Aims We aim to study our population of patients to determine whether their actual weights are congruent with the updated APLS weight estimation. We also compare with the 2005 APLS weight estimate calculation[2]. Method Prospective audit at a large two-site NHS trust with a 23-hour paediatric assessment unit and two in-patient wards. The catchment population for our study has a higher proportion of population in lower socioeconomic groups than the national average[3]. The age, basic diagnosis and weight of consecutive presenting children between 1 month and 12 years were collected for 166 patients in December 2012. We aim to collect data to March 2013 with an estimated sample size of 500. Children were weighed on Seca baby/standing/chair scales (Seca, Hamburg, Germany) with children under two naked and over two wearing minimum clothing without shoes. Percentage weight difference between child’s actual weight and their expected weight was calculated using both the 2005 APLS formula, weight(kg) = (age +4) × 2 and the 2011 formulae: 1–12 months: weight(kg) = (0.5 × age in months)+4; 1–5 years: weight(kg) = (2 × age in years) +8; 6–12 years: weight(kg) = (3 × age in years) +7 Abstract G245(P) Table 1 Results Table 1: Mean weight differences by age Preliminary results outlined in Table 1 demonstrate that although the 2011 APLS calculation is better for weight estimation in our 6–12 years age group than the 2005 calculation, there is still the potential for significant underestimation of weight in all ages. Conclusion Weight estimation is extremely important for paediatric resuscitation and emergency treatment. However, across all age groups weight estimation is no substitute for establishing the child’s actual weight at the earliest opportunity. References Advanced Life Support Group. APLS, Fifth Edition. Blackwell 2011. Advanced Life Support Group. APLS, Fourth Edition. Blackwell 2005. 2011 Census: Key Statistics for local authorities in England and Wales. Office for National Statistics; December 2012.

Abstract We calculate the small-momentum expansion of vector, axial-vector, scalar, and pseudo-scalar heavy-quark current correlators in the large-β 0 limit of QCD, extending the analysis of Grozin and Sturm beyond the vector current. Our results are used to study the higher-order behaviour of dimensionless ratios of vector and pseudo-scalar moments used for the precise extraction of the strong coupling, α s , from relativistic quarkonium sum rules and lattice data, respectively. We show that these ratios benefit from a partial cancellation of the leading renormalon singularities. Our results can guide the design of combinations of moments with improved perturbative behaviour.