| Wall-crossing for punctual Quot-schemes Arkadij Bojko | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Wargames as Data: Addressing the Wargamer's Trilemma Andrew W. Reddie, Ruby E. Booth, Bethany L. Goldblum | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Wasserstein Iterative Networks for Barycenter Estimation Alexander Korotin, Vage Egiazarian, Lingxiao Li | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Wasserstein-Kelly Portfolios: A Robust Data-Driven Solution to Optimize Portfolio Growth Jonathan Yu-Meng Li | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Water 130: Waterworks Mathematics Alvord, Blasberg | L1–3 Foundational | CC-BY | mirrored | 72 pp. | libretexts |
| Water 131: Advanced Water Mathematics Mike Alvord | L1–3 Foundational | CC-BY | mirrored | 74 pp. | libretexts |
| Water 132: Water Supply and Demand in California Stephanie Anagnoson | L1–3 Foundational | CC-BY | mirrored | 67 pp. | libretexts |
| Water 140: Water Distribution Operator I Mike Alvord | L1–3 Foundational | CC-BY | mirrored | 94 pp. | libretexts |
| Water 141: Water Distribution Operator II Mike Alvord | L1–3 Foundational | CC-BY | mirrored | 65 pp. | libretexts |
| Water 160: Wastewater Treatment and Disposal I Nick Steffen | L1–3 Foundational | CC-BY | mirrored | 32 pp. | libretexts |
| Water 161: Wastewater Treatment and Disposal II Nick Steffen | L1–3 Foundational | CC-BY | mirrored | 34 pp. | libretexts |
| Wavelet Analysis for Time Series Financial Signals via Element Analysis Nathan Zavanelli | L4–5 Advanced | CC-BY | mirrored | 6 pp. | arxiv |
| Wavelet transform and diffusion equations: applications to the processing of the "Cassini" spacecraft observations E.B. Postnikov, A.Loskutov | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Weak approximation, Brauer and R-equivalence in algebraic groups over arithmetical fields Nguyen Quoc Thang | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Weak disorder expansion for localization lengths of quasi-1D systems Rudolf A. Roemer, Hermann Schulz-Baldes | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Weak-disorder limit for directed polymers on critical hierarchical graphs with vertex disorder Jeremy Clark, Casey Lochridge | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Weak elastic energy of irregular curves Domenico Mucci, Alberto Saracco | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Weak ergodic theorem for Markov chains without invariant countably additive measures Alexander Zhdanok | L4–5 Advanced | CC-BY | mirrored | 16 pp. | arxiv |
| Weak error rates of numerical schemes for rough volatility Paul Gassiat | L4–5 Advanced | CC-BY | mirrored | 20 pp. | arxiv |
| Weakly constrained-degree percolation on the hypercubic lattice Ivailo Hartarsky, Bernardo N. B. de Lima | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Weak quenched limit theorems for a random walk in a sparse random environment Dariusz Buraczewski, Piotr Dyszewski, Alicja Ko{\l}odziejska | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Weak vs. Strong Correlations: Bid-Ask Spreads for Weather-Contingent Options Rene' Carmona, Dario Villani | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Wealth distribution in a System with Wealth-limited Interactions Marisciel L. Palima, Eduardo J. David | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Web Accessibility for Developers - Essential Skills for Web Developers Digital Education Strategies, The Chang School | L1–3 Foundational | CC-BY-SA | mirrored | 147 pp. | libretexts |
| Weighted RML using ensemble-methods for data assimilation Yuming Ba (1), Dean S. Oliver (2) ((1) Guangdong Polytechnic Normal University, Guangzhou | L4–5 Advanced | CC-BY | mirrored | 22 pp. | arxiv |
| Weinstein Conjecture and GW Invariants Gang Liu, Gang Tian | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Weisfeiler and Leman Go Walking: Random Walk Kernels Revisited Nils M. Kriege | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Wellness Lumen | L1–3 Foundational | CC-BY-SA | mirrored | 452 pp. | libretexts |
| Wellness for the Helping Professions Tina Decker & Emily Pacholski | L1–3 Foundational | CC-BY | mirrored | 72 pp. | libretexts |
| Well-Posedness and Finite Element Approximation of Mixed Dimensional Partial Differential Equations Fredrik Hellman, Axel M{\aa}lqvist, Malin Mosquera | L4–5 Advanced | CC-BY | mirrored | 22 pp. | arxiv |
| Well-posedness of the traveling wave problem for the free boundary compressible Navier-Stokes equations Noah Stevenson, Ian Tice | L4–5 Advanced | CC-BY | mirrored | 158 pp. | arxiv |
| We need to talk about nonprobability samples Robin J. Boyd, Gary D. Powney, Oliver L. Pescott | L4–5 Advanced | CC-BY-NC-ND | mirrored | 16 pp. | arxiv |
| Weyl groups of Hamiltonian manifolds, I Friedrich Knop (Rutgers University) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Weyl's Law for Arbitrary Archimedean Type Ayan Maiti | L4–5 Advanced | CC-BY | mirrored | 25 pp. | arxiv |
| Weyl time evolution operator in planar Bianchi-type-I universes Matthias Wollensak | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| What does machine learning say about the drivers of inflation? Emanuel Kohlscheen | L4–5 Advanced | CC-BY | mirrored | 22 pp. | arxiv |
| What drives passion? An empirical examination on the impact of personality trait interactions and job environments on work passion Annika Breu, Taha Yasseri | L4–5 Advanced | CC-BY | mirrored | 25 pp. | arxiv |
| What Estimators Are Unbiased For Linear Models? Lihua Lei, Jeffrey Wooldridge | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| What is word sense disambiguation good for? Adam Kilgarriff (ITRI, University of Brighton) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| What may future electricity markets look like? Pierre Pinson | L4–5 Advanced | CC-BY | mirrored | 9 pp. | arxiv |
| What really causes large price changes? J. Doyne Farmer, Laszlo Gillemot, Fabrizio Lillo | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| What Religion Is | L2–5 Introductory | Public domain | mirrored | 80 pp. | wikisource |
| What's Trending in Difference-in-Differences? A Synthesis of the Recent Econometrics Literature Jonathan Roth, Pedro H. C. Sant'Anna, Alyssa Bilinski | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| When did Faṣīḥ become Qabīḥ? | L2–5 Introductory | CC-BY | mirrored | 28 pp. | wikisource |
| When is the search of relatively maximal subgroups reduced to quotients? Wenbin Guo, Danila O. Revin | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| When saliency goes off on a tangent: Interpreting Deep Neural Networks with nonlinear saliency maps Jan Rosenzweig, Zoran Cvetkovic, Ivana Rosenzweig | L4–5 Advanced | CC-BY | mirrored | 12 pp. | arxiv |
| Which Explanation Should I Choose? A Function Approximation Perspective to Characterizing Post Hoc Explanations Tessa Han, Suraj Srinivas, Himabindu Lakkaraju | L4–5 Advanced | CC-BY | mirrored | 30 pp. | arxiv |
| Why C++ is not very fit for GUI programming Oleg Kiselyov | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Why Do Students Lie and Should We Worry? An Analysis of Non-truthful Reporting Emil Chrisander, Andreas Bjerre-Nielsen | L4–5 Advanced | CC-BY-NC-SA | mirrored | 41 pp. | arxiv |
| Why Financial Markets Will Remain Marginally Inefficient? Yi-Cheng Zhang | L4–5 Advanced | Licence unknown | link only | — | arxiv |