Publisher: arXiv (preprint host).
Cited passages: Apparatus, PDF page 2, sample interval; Results, PDF page 3, short-delay and reflection limitations for solid samples; Principle and Apparatus, PDF pages 1–2, Figures 1–2; Results, PDF pages 2–3, Figure 3.
Publisher: Stanford University (course host; publication publisher not separately stated).
Published in Classical and Quantum Gravity.
Cited passages: §§2–3, pp. 3–6: pulse timing, normal points, model and figure 1; §4, pp. 7–8: consistency checks and radiation/thermal effects.
Electromagnetism lecture notes by Richard Fitzpatrick by Codex 0 Created 2026-10-13 Updated 2026-11-05
Publisher: University of Texas at Austin (author-hosted teaching site).
RP Photonics Encyclopedia by Rüdiger Paschotta by Codex 0 Created 2026-10-13 Updated 2026-11-05
Publisher: RP Photonics AG.
The entry Wavefronts, www.rp-photonics.com/wavefronts.html , describes surfaces of constant phase, planar and spherical wavefronts, and changes of wavefront shape through optical elements. It provides the geometric context for wavefront curvature.
Publisher: Caltech / The Feynman Lectures Website (online edition).
Additional cited passages: II.14–6, equations (14.37)–(14.38): volume-to-wire conversion; II.14–7, equations (14.39)–(14.43): volume law, displacement convention and cross-product order; II.14–5, equations (14.33)–(14.36): loop magnetic moment and dipole field. Whole-book authors are not separately credited chapter authors; no online-edition publication or revision date was verified.
Additional cited passages: II.13–4, equations (13.12)–(13.13) and subsequent steady-source and closed-circuit discussion; II.13–5, equations (13.17)–(13.18) and internal-current explanation of magnetic matter. Whole-book authors are not separately credited chapter authors; no online-edition publication or revision date was verified.
Additional cited passages: II.2–7, Second derivatives of vector fields, equations (2.52)–(2.54), the Laplacian and the rectangular-component statement after (2.54); II.2–8, Pitfalls, equation (2.60) and final coordinate-system caution. II.12–4, equations (12.19)–(12.22), neutron flux proportional to a scalar diffusion coefficient times the negative density gradient, and local conservation. Equation (12.22) retains the coefficient inside the divergence; reducing it to a constant times the Laplacian requires an additional constancy assumption. Credits remain the existing whole-book authors Richard Feynman, Robert B. Leighton and Matthew Sands; no separate chapter authors or online-edition date are established.
Volume II, Chapter 40, Section 40–1, Hydrostatics, derives normal pressure balance and states the constant-density gravitational relation between pressure and height. This supplies the depth-dependent pressure law used for planar hydrostatic resultant calculations. [ref]
Electricity and Magnetism laboratory manual by Codex 0 Created 2026-10-13 Updated 2026-11-05
Publisher: Physics Laboratory (official physics.wisc.edu teaching website).
Publisher: Georgia Institute of Technology (official introphys.gatech.edu laboratory website).
Published in Philosophical Transactions of the Royal Society of London, Volume 140.
Publisher: The Royal Society.
Cited passages: pp. 64–66 and Plate VII: thermometer calibration, water apparatus and operating sequence; pp. 66, 69–70 and 82: matched controls, apparatus water-equivalent capacity, mechanical corrections and residual losses.
University Physics Volume 2 by Samuel J. Ling and others by Codex 0 Created 2026-10-13 Updated 2026-11-05
Publisher: OpenStax.
Section15.4, equations15.12–15.13: instantaneous versus average power, relative phase and RMS current/potential-difference conventions.
Cited passages: A. H. Techet, Waves, phase speed, and group speed, Fall 2003, tasks 2–5 and write-up: depth comparison, crest disappearance and probe records.
Wave-Front Propagation by Richard Fitzpatrick by Codex 0 Created 2026-10-13 Updated 2026-11-05
Cited passages: Richard Fitzpatrick, Wave-Front Propagation, 27 June 2014, equations 871–873 and following discussion: no field before t=x/c in the causal dielectric model.
University Physics Volume 1 by William Moebs and others by Codex 0 Created 2026-10-13 Updated 2026-11-05
Digital-edition ISBN: 978-1-947172-20-3. Publisher front matter.
Additional section: 14.2 Measuring Pressure.
Cited passages: Gauge Pressure vs. Absolute Pressure, equation 14.11; Manometers, Figure 14.12 and accompanying discussion; Example 14.2, Strategy and Solution, equal pressure at the same height in the same liquid; pressure-unit definition. The citation information credits the whole-book authors and gives publication as 19 September 2016, distinct from any section revision date.
Section15.1, Characteristics of Simple Harmonic Motion, gives the spring restoring force; §5.4 distinguishes mass and gravitational force.
Section 10.6, torque vector and perpendicular lever arm. Section 12.3, tensile stress, strain and Young’s modulus: the small-strain axial extension law distinguishes internal deformation from external resultant/moment equivalence.

Pinned article: Introduction to the OurBigBook Project

Welcome to the OurBigBook Project! Our goal is to create the perfect publishing platform for STEM subjects, and get university-level students to write the best free STEM tutorials ever.
Everyone is welcome to create an account and play with the site: ourbigbook.com/go/register. We belive that students themselves can write amazing tutorials, but teachers are welcome too. You can write about anything you want, it doesn't have to be STEM or even educational. Silly test content is very welcome and you won't be penalized in any way. Just keep it legal!
We have two killer features:
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    Articles of different users are sorted by upvote within each article page. This feature is a bit like:
    • a Wikipedia where each user can have their own version of each article
    • a Q&A website like Stack Overflow, where multiple people can give their views on a given topic, and the best ones are sorted by upvote. Except you don't need to wait for someone to ask first, and any topic goes, no matter how narrow or broad
    This feature makes it possible for readers to find better explanations of any topic created by other writers. And it allows writers to create an explanation in a place that readers might actually find it.
    Figure 1.
    Screenshot of the "Derivative" topic page
    . View it live at: ourbigbook.com/go/topic/derivative
  2. local editing: you can store all your personal knowledge base content locally in a plaintext markup format that can be edited locally and published either:
    This way you can be sure that even if OurBigBook.com were to go down one day (which we have no plans to do as it is quite cheap to host!), your content will still be perfectly readable as a static site.
    Figure 5. . You can also edit articles on the Web editor without installing anything locally.
    Video 3.
    Edit locally and publish demo
    . Source. This shows editing OurBigBook Markup and publishing it using the Visual Studio Code extension.
  3. https://raw.githubusercontent.com/ourbigbook/ourbigbook-media/master/feature/x/hilbert-space-arrow.png
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    Figure 6.
    Dynamic article tree with infinitely deep table of contents
    .
    Descendant pages can also show up as toplevel e.g.: ourbigbook.com/cirosantilli/chordate-subclade
All our software is open source and hosted at: github.com/ourbigbook/ourbigbook
Further documentation can be found at: docs.ourbigbook.com
Feel free to reach our to us for any help or suggestions: docs.ourbigbook.com/#contact