| Turning Speech Into Scripts Manny Rayner, Beth Ann Hockey, Frankie James | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Tutorials of Visual Graphic Communication Programs for Interior Design Yongyeon Cho | L1–3 Foundational | CC-BY-NC | mirrored | 299 pp. | libretexts |
| Twistor and "weak" gauge structures in the framework of quaternionic analysis Vladimir V. Kassandrov, Joseph A. Rizcallah | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Two-dimensional wetting with binary disorder: a numerical study of the loop statistics Thomas Garel, Cecile Monthus | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Two Fractal Overlap Time Series: Earthquakes and Market Crashes Bikas K. Chakrabarti, Arnab Chatterjee, Pratip Bhattacharyya | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Two-Sample Test for High-Dimensional Covariance Matrices: a normal-reference approach Jin-Ting Zhang, Jingyi Wang, Tianming Zhu | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Two-Scale Gradient Descent Ascent Dynamics Finds Mixed Nash Equilibria of Continuous Games: A Mean-Field Perspective Yulong Lu | L4–5 Advanced | CC-BY | mirrored | 25 pp. | arxiv |
| Two-step estimation in linear regressions with adaptive learning Alexander Mayer | L4–5 Advanced | CC-BY-NC-ND | mirrored | 36 pp. | arxiv |
| Two Steps Feature Selection and Neural Network Classification for the TREC-8 Routing Mathieu Stricker, Frantz Vichot, Gerard Dreyfus | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Two-time autocorrelation function in phase-ordering kinetics from local scale-invariance Malte Henkel, Alan Picone, Michel Pleimling | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Type Classes and Constraint Handling Rules Kevin Glynn, Martin Sulzmann, Peter J. Stuckey | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Type-driven semantic interpretation and feature dependencies in R-LFG Mark Johnson (Brown University) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Types of embedded graphs and their Tutte polynomials Stephen Huggett, Iain Moffatt | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Uhlenbeck compactness and transversality for the moduli space of PU(2) monopoles Paul M. N. Feehan, Thomas G. Leness | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Unbalanced Optimal Transport, from Theory to Numerics Thibault S\'ejourn\'e, Gabriel Peyr\'e, Fran\c{c}ois-Xavier Vialard | L4–5 Advanced | CC-BY | mirrored | 70 pp. | arxiv |
| Unbounded Pontryagin numbers on nonnegatively curved spin manifolds E. Hsiao, D. Kotschick | L4–5 Advanced | CC-BY-NC-SA | mirrored | 9 pp. | arxiv |
| Unbox the Blackbox: Predict and Interpret YouTube Viewership Using Deep Learning Jiaheng Xie, Xiao Liu | L4–5 Advanced | CC-BY-NC-ND | mirrored | 43 pp. | arxiv |
| Uncertain Label Correction via Auxiliary Action Unit Graphs for Facial Expression Recognition Yang Liu, Xingming Zhang, Janne Kauttonen | L4–5 Advanced | CC-BY-NC-ND | mirrored | 7 pp. | arxiv |
| Uncertainty quantification for nonconvex tensor completion: Confidence intervals, heteroscedasticity and optimality Changxiao Cai, H. Vincent Poor, Yuxin Chen | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Understanding and Accelerating Neural Architecture Search with Training-Free and Theory-Grounded Metrics Wuyang Chen, Xinyu Gong, Junru Wu | L4–5 Advanced | CC-BY-SA | mirrored | 15 pp. | arxiv |
| Understanding Ingredients for the Canadian Baker BC Cook Articulation Committee | L1–3 Foundational | CC-BY | mirrored | 134 pp. | libretexts |
| Understanding Vaccine Hesitancy: Empirical Evidence from India Pramod Kumar Sur | L4–5 Advanced | CC-BY-NC-ND | mirrored | 91 pp. | arxiv |
| unexpected logarithmic identities and other surprises C. Vignat | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Unicyclic Components in Random Graphs E. Ben-Naim, P.L. Krapivsky | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Uniform Inference in Linear Error-in-Variables Models: Divide-and-Conquer Tom Boot, Art\=uras Juodis | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Uniform semantic treatment of default and autoepistemic logics Marc Denecker, Victor W. Marek, Miroslaw Truszczynski | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Uniform Zariski's Theorem On Fundamental Groups Shulim Kaliman | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Unique Continuation Problem on RCD Spaces. I Qin Deng, Xinrui Zhao | L4–5 Advanced | CC-BY | mirrored | 18 pp. | arxiv |
| Uniquely orderable interval graphs Marta Fiori-Carones, Alberto Marcone | L4–5 Advanced | CC-BY | mirrored | 13 pp. | arxiv |
| Uniqueness of orders and parameters in multi-term time-fractional diffusion equations by short-time behavior Yikan Liu, Masahiro Yamamoto | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Uniqueness of thermodynamic projector and kinetic basis of molecular individualism A. N. Gorban, I. V. Karlin | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Universal bad news principle and pricing of options on dividend-paying assets Svetlana Boyarchenko, Sergei Levendorskii | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Universal correlations of one-dimensional electrons at low density F. G\"ohmann | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Universal correlations of trapped one-dimensional impenetrable bosons Dimitri M. Gangardt | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Universal degeneration of Riemann surfaces and fibered complex surfaces Tadashi Ashikaga, Yukio Matsumoto | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Universality in Quantum Hall Systems: Coset Construction of Incompressible States J. Froehlich, B. Pedrini, C. Schweigert | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Universality of residence-time distributions in non-adiabatic stochastic resonance Nils Berglund, Barbara Gentz | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Universal Limit Theorem for Spectra of iterated inclusion-uniform Subdivisions Julian M\"arte | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Universal Prediction Band via Semi-Definite Programming Tengyuan Liang | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Universal Structure of the Personal Income Distribution Wataru Souma | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| University Physics Volume 1 | L1–2 Foundational | CC-BY-NC-SA | mirrored | 959 pp. | openstax |
| University Physics Volume 2 | L1–2 Foundational | CC-BY-NC-SA | mirrored | 781 pp. | openstax |
| University Physics Volume 3 | L1–2 Foundational | CC-BY-NC-SA | mirrored | 597 pp. | openstax |
| UNIX Resource Managers: Capacity Planning and Resource Issues Neil J. Gunther | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Unlimited Vocabulary Grapheme to Phoneme Conversion for Korean TTS Byeongchang Kim, WonIl Lee, Geunbae Lee | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Unstable even-parity eigenmodes of the regular static SU(2) Yang-Mills-dilaton solutions O.I. Streltsova, E.E. Donets, E.A. Hayryan | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Unsupervised Representation Learning with Minimax Distance Measures Morteza Haghir Chehreghani | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Un th\'eor\`eme de Rao pour les familles de courbes gauches Robin Hartshorne, Mireille Martin-Deschamps, Daniel Perrin | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Update statistics in conservative parallel discrete event simulations of asynchronous systems A. Kolakowska, M. A. Novotny, Per Arne Rikvold | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Upper bounds on mixing time of finite Markov chains John Rhodes, Anne Schilling | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |