| Pyroelectric vector and related polarization effects Eugene V. Kholopov | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Pythagoras Source Book and Library | L2–5 Introductory | Public domain | mirrored | 361 pp. | wikisource |
| QPanda: high-performance quantum computing framework for multiple application scenarios Menghan Dou, Tianrui Zou, Yuan Fang | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| q-Random Matrix Ensembles K.A. Muttalib, Y. Chen, M.E.H. Ismail | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Quadratic Differentials, Quaternionic Forms, and Surfaces George I. Kamberov | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Quadratic metric-affine gravity Dmitri Vassiliev | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Quant 4.0: Engineering Quantitative Investment with Automated, Explainable and Knowledge-driven Artificial Intelligence Jian Guo, Saizhuo Wang, Lionel M. Ni | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Quantifying impact on safety from cyber-attacks on cyber-physical systems Eleftherios Vlahakis, Gregory Provan, Gordon Werner | L4–5 Advanced | CC-BY | mirrored | 8 pp. | arxiv |
| Quantifying out-of-station waiting time in oversaturated urban metro systems Kangli Zhu, Zhanhong Cheng, Jianjun Wu | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Quantifying Theory in Politics: Identification, Interpretation and the Role of Structural Methods Nathan Canen, Kristopher Ramsay | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Quantile Autoregression-based Non-causality Testing Weifeng Jin | L4–5 Advanced | CC-BY | mirrored | 36 pp. | arxiv |
| Quantile Off-Policy Evaluation via Deep Conditional Generative Learning Yang Xu, Chengchun Shi, Shikai Luo | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Quantitative analysis of privatization M. Vahabi, G. R. Jafari | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Quantitative comparisons between finitary posterior distributions and Bayesian posterior distributions Federico Bassetti | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Quantization of discretized spacetimes and the correspondence principle Ioannis Raptis, Roman R. Zapatrin | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Quantum Amnesia Leaves Cryptographic Mementos: A Note On Quantum Skepticism Or Sattath, Uriel Shinar | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Quantum Boltzmann Machines: Applications in Quantitative Finance Cameron Perot | L4–5 Advanced | CC-BY | mirrored | 62 pp. | arxiv |
| Quantum classical hybrid neural networks for continuous variable prediction Prateek Jain, Alberto Garcia Garcia | L4–5 Advanced | CC-BY-SA | mirrored | 10 pp. | arxiv |
| Quantum cohomology of the moduli space of stable bundles over a Riemann surface Vicente Mu\~noz | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Quantum differentials of Spectral triples, Dirichlet spaces and discrete groups Fabio E.G. Cipriani, Jean-Luc Sauvageot | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Quantum Field Theory of Treasury Bonds Belal E. Baaquie | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Quantum Hall Systems: Braid groups, composite fermions, and fractional charge Lucjan Jacak, Piotr Sitko, Konrad Wieczorek | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Quantum Hyperplane Section Theorem For Homogeneous Spaces Bumsig Kim (University of California - Davis) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Quantum Space-Time as a Quantum Causal Set Ioannis Raptis | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Quartic and Quintic hypersurfaces with dense rational points Alex Massarenti | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Quasi-algebraic geometry of curves I. Riemann-Roch theorem and Jacobian Ilya Zakharevich | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Quasiconvex Analysis of Backtracking Algorithms David Eppstein | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Quasi-crystals for arbitrary root systems and associated generalizations of the hypoplactic monoid Alan J. Cain, Ricardo P. Guilherme, Ant\'onio Malheiro | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Quasicrystals. The Technique for Constructing Quasiperiodic Structures Vadim Gulyaev | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Quasi-Locality Bounds for Quantum Lattice Systems. Part II. Perturbations of Frustration-Free Spin Models with Gapped Ground States Bruno Nachtergaele, Robert Sims, Amanda Young | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Quasistatically varying log-normal distribution in the middle scale region of Japanese land prices Atushi Ishikawa | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Queue-length Variations In A Two-Restaurant Problem Anindya S. Chakrabarti, Bikas K. Chakrabarti | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Queues, Stacks, and Transcendentality at the Transition to Chaos Cristopher Moore, Porus Lakdawala | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Química 2ed | L1–2 Foundational | Licence unknown | link only | — | openstax |
| Química: Comenzando con los átomos 2ed | L1–2 Foundational | Licence unknown | link only | — | openstax |
| QUIP - A Tool for Computing Nonmonotonic Reasoning Tasks Uwe Egly, Thomas Eiter, Hans Tompits | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Quotients of multiplicative forms and Poisson reduction Alejandro Cabrera, Cristian Ortiz | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Rabinowitz Fukaya categories and the categorical formal punctured neighborhood of infinity Sheel Ganatra, Yuan Gao, Sara Venkatesh | L4–5 Advanced | CC-BY | mirrored | 82 pp. | arxiv |
| Random fields, large deviations and triviality in quantum field theory. Part II Adnan Aboulalaa | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Random forests, sound symbolism and Pokemon evolution Alexander James Kilpatrick, Aleksandra Cwiek, Shigeto Kawahara | L4–5 Advanced | CC-BY | mirrored | 27 pp. | arxiv |
| Random Fully Connected Neural Networks as Perturbatively Solvable Hierarchies Boris Hanin | L4–5 Advanced | CC-BY | mirrored | 86 pp. | arxiv |
| Random Geometric Series E. Ben-Naim, P.L. Krapivsky | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Random k-SAT: Two Moments Suffice to Cross a Sharp Threshold Dimitris Achlioptas, Cristopher Moore | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Random matrix theory and the evolution of business cycle synchronisation 1886-2006 Paul Ormerod | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Random Partitioning Problems Involving Poisson Point Processes On The Interval Thierry Huillet (LPTM) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Random perturbation of low rank matrices: Improving classical bounds Sean O'Rourke, Van Vu, Ke Wang | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Random walks, liquidity molasses and critical response in financial markets J.-P. Bouchaud, J. Kockelkoren, M. Potters | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Ranked Choice Bedlam in a 2022 Oakland School Director Election David McCune | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Ranking Differential Privacy Shirong Xu, Will Wei Sun, Guang Cheng | L4–5 Advanced | CC-BY | mirrored | 59 pp. | arxiv |
| Ranking Inferences Based on the Top Choice of Multiway Comparisons Jianqing Fan, Zhipeng Lou, Weichen Wang | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |