| Passages from the Life of a Philosopher | L2–5 Introductory | Public domain | mirrored | 507 pp. | wikisource |
| Passenger Path Choice Estimation Using Smart Card Data: A Latent Class Approach with Panel Effects Across Days Baichuan Mo, ZhenLiang Ma, Haris N. Koutsopoulos | L4–5 Advanced | CC-BY | mirrored | 26 pp. | arxiv |
| PatchUp: A Feature-Space Block-Level Regularization Technique for Convolutional Neural Networks Mojtaba Faramarzi, Mohammad Amini, Akilesh Badrinaaraayanan | L4–5 Advanced | CC-BY | mirrored | 19 pp. | arxiv |
| Path Integral Method for Pricing Proportional Step Double-Barrier Option with Time Dependent Parameters Qi Chen, Chao Guo | L4–5 Advanced | CC-BY | mirrored | 18 pp. | arxiv |
| Pathwise inequalities for local time: Applications to Skorokhod embeddings and optimal stopping A. M. G. Cox, David Hobson, Jan Ob{\l}\'oj | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Pattern Discovery and Computational Mechanics Cosma Rohilla Shalizi, James P. Crutchfield (Santa Fe Institute) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Pattern-Division Multiplexing for Continuous-Aperture MIMO Zijian Zhang, Linglong Dai | L4–5 Advanced | CC0-1.0 | mirrored | 6 pp. | arxiv |
| Pattern Matching for sets of segments Alon Efrat, Piotr Indyk, Suresh Venkatasubramanian | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Patterns of consumption in socio-economic models with heterogeneous interacting agents Giulia Iori (University of Essex) Vassilis Koulovassilopoulos (University of Athens) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| PCA-based Data Reduction and Signal Separation Techniques for James-Webb Space Telescope Data Processing G\"uray Hatipo\u{g}lu | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| PCW-Net: Pyramid Combination and Warping Cost Volume for Stereo Matching Zhelun Shen, Yuchao Dai, Xibin Song | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Penalized Optimal Scaling for Ordinal Variables with an Application to International Classification of Functioning Core Sets Aisouda Hoshiyar, Henk A.L. Kiers, Jan Gertheiss | L4–5 Advanced | CC-BY-NC-ND | mirrored | 39 pp. | arxiv |
| Pensieve 5G: Implementation of RL-based ABR Algorithm for UHD 4K/8K Content Delivery on Commercial 5G SA/NR-DC Network Kasidis Arunruangsirilert, Bo Wei, Hang Song | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Percolation-Based Model of New-Product Diffusion with Macroscopic Feedback Effects Martin Hohnisch, Sabine Pittnauer, Dietrich Stauffer | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Percolation with Multiple Giant Clusters E. Ben-Naim, P.L. Krapivsky | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Perfect models for finite Coxeter groups Eric Marberg, Yifeng Zhang | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Performance attribution with respect to interest rates, FX, carry, and residual market risks Jan-Frederik Mai | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Performance Evaluations of C-Band 5G NR FR1 (Sub-6 GHz) Uplink MIMO on Urban Train Kasidis Arunruangsirilert, Pasapong Wongprasert, Jiro Katto | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Performing work efficiently in the presence of faults Cynthia Dwork, Joseph Y. Halpern, O. Waarts | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Period domains for gravitational instantons Tsung-Ju Lee, Yu-Shen Lin | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Periodic diffraction patterns for 1D quasicrystals Pawel Buczek, Lorenzo Sadun, Janusz Wolny | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Periodic Ground States in the Neutral Falicov-Kimball Model in Two Dimensions Karl Haller, Tom Kennedy | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Permutation-generated maps between Dyck paths Kevin Limanta, Hopein Christofen Tang, Yozef Tjandra | L4–5 Advanced | CC-BY-NC-SA | mirrored | 20 pp. | arxiv |
| Perpetual American options within CTRW's Miquel Montero | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Person-Centered Planning for Disability Services Kelly Kulzer | L1–3 Foundational | CC-BY-NC-SA | mirrored | 60 pp. | libretexts |
| Perturbation of a lattice spectral band by a nearby resonance A. K. Motovilov, W. Sandhas, V. B. Belyaev | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Perturbative results on localization for a driven two-level system Marco Frasca | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Pessimistic Minimax Value Iteration: Provably Efficient Equilibrium Learning from Offline Datasets Han Zhong, Wei Xiong, Jiyuan Tan | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Pessimistic Model-based Offline Reinforcement Learning under Partial Coverage Masatoshi Uehara, Wen Sun | L4–5 Advanced | CC-BY | mirrored | 52 pp. | arxiv |
| Pharmacology for Nurses | L1–2 Foundational | CC-BY-NC-SA | mirrored | 1,229 pp. | openstax |
| Pharmacology - Principles and Application for Medical Assistants Anna Jannak | L1–3 Foundational | CC-BY | mirrored | 290 pp. | libretexts |
| Phase Clocks for Transient Fault Repair Ted Herman | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Phase Diagram for the Constrained Integer Partitioning Problem C. Borgs, J.T. Chayes, S. Mertens | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Phase I Analysis of High-Dimensional Processes in the Presence of Outliers Mohsen Ebadi, Shojaeddin Chenouri, Stefan H. Steiner | L4–5 Advanced | CC0-1.0 | mirrored | 41 pp. | arxiv |
| Phase transition in the rich-get-richer mechanism due to finite-size effects James P. Bagrow, Jie Sun, Daniel ben-Avraham | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Phase Transition of Dynamical Herd Behaviors in Financial Markets Kyungsik Kim, Seong-Min Yoon | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Phase transitions on Markovian bipartite graphs - an application of the zero-range process Otto Pulkkinen, Juha Merikoski | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Philosophical Essays Concerning Human Understanding | L2–5 Introductory | Public domain | mirrored | 249 pp. | wikisource |
| Phutball Endgames are Hard Erik D. Demaine, Martin L. Demaine, David Eppstein | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Physical Assessment Pearline Okumakpeyi | L1–3 Foundational | CC-BY-NC | link only | — | libretexts |
| Physical Momentum in the Indian Stock Market Naresh Kumar Devulapally, Tulasi Narendra Das Tripurana | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Physics | L1–2 Foundational | CC-BY | mirrored | 875 pp. | openstax |
| Physics of Personal Income Wataru Souma | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Planar equilibrium measure problem in the quadratic fields with a point charge Sung-Soo Byun | L4–5 Advanced | CC-BY | mirrored | 20 pp. | arxiv |
| Planar Tur\'{a}n number of disjoint union of $C_3$ and $C_4$ Ping Li | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Planning Paths through Occlusions in Urban Environments Yutao Han, Youya Xia, Guo-Jun Qi | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Planning with Complex Data Types in PDDL Mojtaba Elahi, Jussi Rintanen | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Planning with Incomplete Information Antonis Kakas, Rob Miller, Francesca Toni | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Plato or Protagoras? | L2–5 Introductory | Public domain | mirrored | 28 pp. | wikisource |
| Plotinus (MacKenna) | L2–5 Introductory | Public domain | mirrored | 28 pp. | wikisource |