| Probabilistic Default Reasoning with Conditional Constraints Thomas Lukasiewicz | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Probabilistic Event Categorization Janyce Wiebe (New Mexico State University), Rebecca Bruce (Southern Methodist University), Lei Duan (Sony Corporation) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Probabilistic Inductive Inference:a Survey Andris Ambainis | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Probabilistic load forecasting for the low voltage network: forecast fusion and daily peaks Ciaran Gilbert, Jethro Browell, Bruce Stephen | L4–5 Advanced | CC-BY | mirrored | 21 pp. | arxiv |
| Probabilistic Parsing Using Left Corner Language Models Christopher D. Manning (University of Sydney), Bob Carpenter (Lucent Technologies Bell Labs) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Probability distribution of returns in the Heston model with stochastic volatility Adrian A. Dragulescu, Victor M. Yakovenko | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Probability Interpretation for Klein-Gordon Fields and the Hilbert Space Problem in Quantum Cosmology Ali Mostafazadeh | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Problem solving in ID-logic with aggregates: some experiments Bert Van Nuffelen, Marc Denecker | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Proceedings of the 8th International Workshop on Non-Monotonic Reasoning, NMR'2000 Chitta Baral, Miroslaw Truszczynski | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Proceedings of the Fourth International Workshop on Automated Debugging (AADEBUG 2000) M. Ducasse (IRISA/INSA de Rennes) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Processing Self Corrections in a speech to speech system Joerg Spilker, Martin Klarner, Guenther Goerz | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Procrustes-based distances for exploring between-matrices similarity Angela Andreella, Riccardo De Santis, Anna Vesely | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Product Distribution Field Theory David H. Wolpert | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Productivity Dispersion: Facts, Theory, and Implications Hideaki Aoyama, Hiroshi Yoshikawa, Hiroshi Iyetomi | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Professional Ethics in Law Enforcement Henry White | L1–3 Foundational | CC-BY-NC-SA | mirrored | 147 pp. | libretexts |
| Professional Web Accessibility Auditing Made Easy Digital Education Strategies, The Chang School | L1–3 Foundational | CC-BY-SA | mirrored | 162 pp. | libretexts |
| Programming in Alma-0, or Imperative and Declarative Programming Reconciled Krzysztof R. Apt, Andrea Schaerf | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Projecting Non-Fungible Token (NFT) Collections: A Contextual Generative Approach Wesley Joon-Wie Tann, Akhil Vuputuri, Ee-Chien Chang | L4–5 Advanced | CC-BY-NC-ND | mirrored | 12 pp. | arxiv |
| Projection Robust Wasserstein Distance and Riemannian Optimization Tianyi Lin, Chenyou Fan, Nhat Ho | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Projectivity of moment map quotients Peter Heinzner, Luca Migliorini | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Proof Nets and the Complexity of Processing Center-Embedded Constructions Mark Johnson (Brown University) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Proof of the local REM conjecture for number partitioning I: Constant energy scales Christian Borgs, Jennifer Chayes, Stephan Mertens | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Proofs of existence of local potentials for trace-free symmetric 2-forms using dimensionally dependent identities S. Brian Edgar | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Properties of low variability periods in financial time series R. Kitt, J. Kalda | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Properties of the wealth process in a market microstructure model Ted Theodosopoulos, Ming Yuen | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Properties of three functions relating to the exponential function and the existence of partitions of unity Feng Qi | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Proposed Experiments to Test the Unified Description of Gravitation and Electromagnetism through a Symmetric Metric Murat \"Ozer | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Prospects for in-depth story understanding by computer Erik T. Mueller | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Provably Efficient Model-Free Constrained RL with Linear Function Approximation Arnob Ghosh, Xingyu Zhou, Ness Shroff | L4–5 Advanced | CC-BY-NC-ND | mirrored | 32 pp. | arxiv |
| Provably Reliable Large-Scale Sampling from Gaussian Processes Anthony Stephenson, Robert Allison, Edward Pyzer-Knapp | L4–5 Advanced | CC-BY | mirrored | 18 pp. | arxiv |
| Proving Failure of Queries for Definite Logic Programs Using XSB-Prolog Nikolay Pelov, Maurice Bruynooghe | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| PRUDEX-Compass: Towards Systematic Evaluation of Reinforcement Learning in Financial Markets Shuo Sun, Molei Qin, Xinrun Wang | L4–5 Advanced | CC-BY | mirrored | 31 pp. | arxiv |
| Pseudo-diffusions and Quadratic term structure models Sergei Levendorskii | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| PSM: A Predictive Safety Model for Body Motion Based On the Spring-Damper Pendulum Seyed Amir Tafrishi, Ankit A. Ravankar, Yasuhisa Hirata | L4–5 Advanced | CC-BY | mirrored | 9 pp. | arxiv |
| PSPACE Reasoning for Graded Modal Logics Stephan Tobies | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Psychiatric-Mental Health Nursing | L1–2 Foundational | CC-BY-NC-SA | mirrored | 1,015 pp. | openstax |
| Psychologia | L1–2 Foundational | CC-BY | mirrored | 788 pp. | openstax |
| Psychology | L1–2 Foundational | CC-BY | mirrored | 754 pp. | openstax |
| Psychology 2e | L1–2 Foundational | CC-BY-NC-SA | mirrored | 755 pp. | openstax |
| PublicCheck: Public Integrity Verification for Services of Run-time Deep Models Shuo Wang, Sharif Abuadbba, Sidharth Agarwal | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Public Health Ethics - Cases Spanning the Globe Drue H. Barrett, Angus Dawson & Leonard W. Ortmann | L1–3 Foundational | CC-BY-NC | link only | — | libretexts |
| Public Health in Pharmacy Practice 2e - A Casebook Jordan R. Covvey, Vibhuti Arya, Natalie A. DiPietro Mager | L1–3 Foundational | CC-BY | mirrored | 275 pp. | libretexts |
| Public Health Introduction Janey Skinner | L1–3 Foundational | CC-BY-NC-SA | mirrored | 445 pp. | libretexts |
| Public School History of England and Canada | L2–5 Introductory | Public domain | mirrored | 296 pp. | wikisource |
| Pullbacks of Brill-Noether Classes Under Abel-Jacobi Sections Sam Molcho | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Pulmonary Pathophysiology Andrew Binks | L1–3 Foundational | CC-BY-NC-SA | mirrored | 87 pp. | libretexts |
| Pure Hodge structure on the $L_2$-cohomology of varieties with isolated singularities William Pardon, Mark Stern (Duke University) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| PushPush and Push-1 are NP-hard in 2D Erik D. Demaine, Martin L. Demaine, Joseph O'Rourke | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| PushPush is NP-hard in 2D Erik D. Demaine, Martin L. Demaine, Joseph O'Rourke | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| P-values: misunderstood and misused Bertie Vidgen, Taha Yasseri | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |