| Shop Measurement and Calculations Robert Fergesen | L1–3 Foundational | CC-BY-NC-SA | mirrored | 39 pp. | libretexts |
| Short-term equity dynamics and endogenous market fluctuations Ted Theodosopoulos, Muffasir Badshah | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Short-term market reaction after extreme price changes of liquid stocks Adam G. Zawadowski, Gyorgy Andor, Janos Kertesz | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Shrinkage and spectral filtering of correlation matrices: a comparison via the Kullback-Leibler distance M. Tumminello, F. Lillo, R. N. Mantegna | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Signal Enhancement for Magnetic Navigation Challenge Problem Albert R. Gnadt, Joseph Belarge, Aaron Canciani | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Signals for Cellular Automata in dimension 2 or higher Jean-Christophe Dubacq (LIPN, GREYC), Veronique Terrier (GREYC) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Signatures of Randomness in Quantum Chaos Piotr Garbaczewski | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Significance of log-periodic signatures in cumulative noise Hans-Christian Graf v. Bothmer | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Silkswap: An asymmetric automated market maker model for stablecoins Nicola Cantarutti, Alex Harker, Carter Woetzel | L4–5 Advanced | CC-BY-NC-ND | mirrored | 18 pp. | arxiv |
| Sim Labs for Thermodynamics and Thermal Power Plant Simulator Serhat Beyeni, Sanja Boskovic | L1–3 Foundational | CC-BY | mirrored | 41 pp. | libretexts |
| Simple geometric mitosis Valentina Kiritchenko | L4–5 Advanced | CC-BY | mirrored | 15 pp. | arxiv |
| Simple Type and the Boundary of Moduli Space David Groisser, Lorenzo Sadun | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Simple Type is Not a Boundary Phenomenon Lorenzo Sadun (University of Texas at Austin) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Simplifying and Improving: Revisiting Bulgaria's Revenue Forecasting Models Fabio Ashtar Telarico | L4–5 Advanced | CC-BY-NC-SA | mirrored | 24 pp. | arxiv |
| Simplifying Tensor Polynomials with Indices A. Balfagon (1), X. Jaen (2) ((1) Institut Quimic de Sarria, Laboratori de Fisica Matematica | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Simulated bifurcation for higher-order cost functions Taro Kanao, Hayato Goto | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Single Curve Collapse of the Price Impact Function for the New York Stock Exchange Fabrizio Lillo, J. Doyne Farmer, Rosario N. Mantegna | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Singularity-Avoidance Prescribed Performance Attitude Tracking of Spacecraft Jiakun Lei, Tao Meng, Weijia Wang | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Singular Perturbation Expansion for Utility Maximization with Order-$\epsilon$ Quadratic Transaction Costs Andrew Papanicolaou, Shiva Chandra | L4–5 Advanced | CC-BY | mirrored | 15 pp. | arxiv |
| Sinkhorn Divergences for Unbalanced Optimal Transport Thibault S\'ejourn\'e, Jean Feydy, Fran\c{c}ois-Xavier Vialard | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Six metaphysical meditations: $b Wherein it is proved that there is a God and that mans mind is really distinct from his body Descartes, René, Molyneux, William | L2–5 Introductory | Public domain | mirrored | — | gutenberg |
| SL(2,C) Gauge Theory of Gravitation and the Quantization of the Gravitational Field Moshe Carmeli (Ben Gurion U.), Shimon Malin (Colgate U.) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| SLDNFA-system Bert Van Nuffelen | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| SLT-Resolution for the Well-Founded Semantics Yi-Dong Shen, Li-Yan Yuan, Jia-Huai You | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Small Maximal Independent Sets and Faster Exact Graph Coloring David Eppstein | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Smile dynamics -- a theory of the implied leverage effect Stefano Ciliberti, Jean-Philippe Bouchaud, Marc Potters (CFM) | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Smodels: A System for Answer Set Programming Ilkka Niemela, Patrik Simons, Tommi Syrjanen | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Smooth forecasting with the smooth package in R Ivan Svetunkov | L4–5 Advanced | CC-BY-NC-SA | mirrored | 20 pp. | arxiv |
| Smooth globally hyperbolic splittings and temporal functions Antonio N. Bernal, Miguel S\'anchez | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Social herding in mean field games Deepanshu Vasal | L4–5 Advanced | CC-BY | mirrored | 4 pp. | arxiv |
| Socioeconomics of Urban Travel in the U.S.: Evidence from the 2017 NHTS Xize Wang, John L. Renne | L4–5 Advanced | CC-BY | mirrored | 46 pp. | arxiv |
| Soft Actor-Critic Deep Reinforcement Learning for Fault Tolerant Flight Control Killian Dally, Erik-Jan van Kampen | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| SoK: Decentralized Exchanges (DEX) with Automated Market Maker (AMM) Protocols Jiahua Xu, Krzysztof Paruch, Simon Cousaert | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| SoK: Yield Aggregators in DeFi Simon Cousaert, Jiahua Xu, Toshiko Matsui | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Solaris System Resource Manager: All I Ever Wanted Was My Unfair Advantage (And Why You Can't Have It!) Neil J. Gunther | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Solar Term Anomaly in China Stock Market: Evidence from Shanghai Index Zhou Tianbao, Li Xinghao, Zhao Junguang | L4–5 Advanced | CC-BY-NC-ND | mirrored | 27 pp. | arxiv |
| Soliton solutions in the class of implicit difference schemes V.V. Makhro | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Solution to the Equity Premium Puzzle Atilla Aras | L4–5 Advanced | CC-BY | mirrored | 41 pp. | arxiv |
| Solving Multistage Stochastic Linear Programming via Regularized Linear Decision Rules: An Application to Hydrothermal Dispatch Planning Felipe Nazare, Alexandre Street | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Some apparently disjoint aims and requirements for grammar development environments: the case of natural language generation John A. Bateman (Language, Communication Research Centre, Dept. of English Studies | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Some applications and methods of large deviations in finance and insurance Huyen Pham (PMA) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Some Conclusions on Markov Matrices and Transformations Chengshen Xu | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Some curvature restrictions on $3$-dimensional generalized ($\kappa ,\mu $)-contact metric manifolds Manoj Ray Bakshi, Kanak Kanti Baishya | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Some global results for asymptotically simple spacetimes Gregory J. Galloway | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Some identities on generalized harmonic numbers and generalized harmonic functions Dae san Kim, Hye Kyung Kim, Taekyun Kim | L4–5 Advanced | CC-BY | mirrored | 9 pp. | arxiv |
| Some measure-theoretical and dynamical properties of successive minima on the space of unimodular lattices Hao Xing | L4–5 Advanced | CC-BY | mirrored | 34 pp. | arxiv |
| Some Ontological Principles for Designing Upper Level Lexical Resources Nicola Guarino (LADSEB-CNR, Padova, Italy) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Some Properties of Preposition and Subordinate Conjunction Attachments Alexander S. Yeh, Marc B. Vilain (Mitre Corporation) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Some Remarks on Boolean Constraint Propagation Krzysztof R. Apt | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Some remarks on convex body domination Tuomas P. Hyt\"onen | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |