| Testing for an ignorable sampling bias under random double truncation Jacobo de U\~na-\'Alvarez | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Testing separability for continuous functional data Holger Dette, Gauthier Dierickx, Tim Kutta | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Testing the Stability of the 2000-2003 US Stock Market "Antibubble" W.-X. Zhou (ECUST, Ucla), D. Sornette (UCLA | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Text | L1–3 Foundational | CC-BY-NC-SA | mirrored | 578 pp. | libretexts |
| Textbook of Cardiology de Jong, van der Waals Eds. | L1–3 Foundational | CC-BY-NC-SA-3.0 | link only | — | libretexts |
| Textual Economy through Close Coupling of Syntax and Semantics Matthew Stone, Bonnie Webber (University of Pennsylvania) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| The American Carbon Manual | L2–5 Introductory | Public domain | mirrored | 114 pp. | wikisource |
| The American put and European options near expiry, under Levy processes Sergei Levendorskii | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| The Anatomy of a Cryptocurrency Pump-and-Dump Scheme Jiahua Xu, Benjamin Livshits | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| The AP Physics Collection | L1–2 Foundational | CC-BY | mirrored | 1,694 pp. | openstax |
| The approach to modeling the value of statistical life using average per capita income Stanislav Levytskyi, Oleksandr Gneushev, Vasyl Makhlinets | L4–5 Advanced | CC-BY-SA | mirrored | 18 pp. | arxiv |
| The arithmetic-geometric mean and isogenies for curves of higher genus Ron Donagi, Ron Livne | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| The Art of Bookbinding | L2–5 Introductory | Public domain | mirrored | 221 pp. | wikisource |
| The Art of Controversy and Other Posthumous Papers | L2–5 Introductory | Public domain | mirrored | 100 pp. | wikisource |
| The Art of Distillation | L2–5 Introductory | Public domain | mirrored | 238 pp. | wikisource |
| The association between Marital Locus of Control and break-up intentions David Boto-Garc\'ia, Federico Perali | L4–5 Advanced | CC-BY | mirrored | 28 pp. | arxiv |
| The Asymptotic Distribution of the MLE in High-dimensional Logistic Models: Arbitrary Covariance Qian Zhao, Pragya Sur, Emmanuel J. Cand\`es | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| The Baum-Connes property for a quantum (semi-)direct product Rub\'en Martos | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| The Berkelmans-Pries Feature Importance Method: A Generic Measure of Informativeness of Features Joris Pries, Guus Berkelmans, Sandjai Bhulai | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| The Best of Both Worlds: a Framework for Combining Degradation Prediction with High Performance Super-Resolution Networks Matthew Aquilina, Keith George Ciantar, Christian Galea | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| The beta function of a knot Jean-Luc Brylinski | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| The Bisimulation Problem for equational graphs of finite out-degree G. Senizergues | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| The Bismut-Elworthy-Li formula for jump-diffusions and applications to Monte Carlo pricing in finance T. R. Cass, P. K. Friz | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| The Cauchy problem for the generalized hyperbolic Novikov-Veselov equation via the Moutard symmetries Alla Yurova, Artyom Yurov, Valerian Yurov | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| The Cauchy Relations in Linear Elasticity Theory Friedrich W. Hehl (Cologne), Yakov Itin (Jerusalem) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| The Character of the Infinite Wedge Representation Spencer Bloch, Andrei Okounkov | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| The chemical distance in random interlacements in the low-intensity regime Sarai Hernandez-Torres, Eviatar B. Procaccia, Ron Rosenthal | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| The Chromatic Number of Random Regular Graphs Dimitris Achlioptas, Cristopher Moore | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| The Collected Works of Dugald Stewart | L2–5 Introductory | Public domain | mirrored | 2 pp. | wikisource |
| The Combinational Mutation Strategy of Differential Evolution Algorithm for Pricing Vanilla Options and Its Implementation on Data during Covid-19 Pandemic Werry Febrianti, Kuntjoro Adji Sidarto, Novriana Sumarti | L4–5 Advanced | CC-BY | mirrored | 16 pp. | arxiv |
| The Competition for Partners in Matching Markets Yash Kanoria, Seungki Min, Pengyu Qian | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| The Competitiveness of On-Line vis-a-vis Conventional Retailing: A Preliminary Study Ivan Png | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| The Complete Subjective Health Assessment L. Jennifer Lapum et al. | L1–3 Foundational | CC-BY-SA | link only | — | libretexts |
| The Concurrent Language Aldwych Matthew Huntbach | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| The conformal geometry of Random Regge Triangulations M. Carfora, C. Dappiaggi, A. Marzuoli | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| The continuous-time pre-commitment KMM problem in incomplete markets Guohui Guan, Zongxia Liang, Yilun Song | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| The Contribution of Tourism in National Economies: Evidence of Greece Olga Kalantzi, Dimitrios Tsiotas, Serafeim Polyzos | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| The corn law question shortly investigated | L2–5 Introductory | Public domain | mirrored | 22 pp. | wikisource |
| The Cosmic Graph: Optimal Information Extraction from Large-Scale Structure using Catalogues T. Lucas Makinen, Tom Charnock, Pablo Lemos | L4–5 Advanced | CC-BY | mirrored | 14 pp. | arxiv |
| The COVID-19 vaccination, preventive behaviors and pro-social motivation: panel data analysis from Japan Eiji Yamamura, Yoshiro Tsutsui, Fumio Ohtake | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| The Craft of Teaching: Engaging Techniques for Higher Education Jennifer Solka | L1–3 Foundational | CC-BY-NC-SA | mirrored | 46 pp. | libretexts |
| The Critique of Pure Reason Kant, Immanuel, Meiklejohn, J. M. D. (John Miller Dow) | L2–5 Introductory | Public domain | mirrored | — | gutenberg |
| The Cross Products of M Vectors in N-dimensional Spaces and Their Geometric Significance Chengshen Xu | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| The Crystal Ball - Instruction Manual I: Introduction to Data Science Stephen Davies | L1–3 Foundational | CC-BY-SA | mirrored | 226 pp. | libretexts |
| The CTRW in finance: Direct and inverse problems with some generalizations and extensions Jaume Masoliver, Miquel Montero, Josep Perello | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| The density of sets containing large similar copies of finite sets Kenneth Falconer, Vjekoslav Kova\v{c}, Alexia Yavicoli | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| The derivatives of Asian call option prices Jungmin Choi, Kyounghee Kim | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| The descendants of the 3d-index Zhihao Duan, Stavros Garoufalidis, Jie Gu | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| The Design Principle of Blockchain: An Initiative for the SoK of SoKs Luyao Sunshine Zhang | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| The Difference-of-Log-Normals Distribution: Properties, Estimation, and Growth Robert Parham | L4–5 Advanced | CC-BY-NC-SA | mirrored | 30 pp. | arxiv |