Primality testing: then and now by Carl Pomerance by Codex 0 Created 2026-10-13 Updated 2026-11-05
By Carl Pomerance. Slides for the ICERM meeting "Seventy-five years of Mathematics of Computation", 1–3 November 2018.
Cited passages: slide 14 states Pépin's test and outlines its proof; slides 15–16 describe Fermat numbers and their role in integer factorization; slide 18 gives the Gauss-Wantzel theorem and distinguishes Gauss's construction result from Wantzel's necessity proof. Numerical records elsewhere in these 2018 slides are historical records, not claims about current records.
By Leonhard Euler; English translation by Jordan Bell. Presented to the St Petersburg Academy on 26 September 1732; the original Latin paper, "Observationes de theoremate quodam Fermatiano aliisque ad numeros primos spectantibus", appeared in Commentarii academiae scientiarum Petropolitanae 6 (1738), pp. 103–107. The publication note on page one of the translation distinguishes presentation from publication. The linked translation is version three, dated 15 April 2008.
Catalogue record: arxiv.org/abs/math/0501118
Cited passages: pp. 1–2, Euler's account of Fermat's proposed prime pattern and the factor of ; p. 1 publication and translator note. The short modular check in Fermat number is presented as a modern verification, not a historical reconstruction of Euler's search.
Introduction to Multigrid Methods by Long Chen by Codex 0 Created 2026-10-13 Updated 2026-11-05
Cited passages: Long Chen, Introduction to Multigrid Methods, 17 December 2011, section 2: plain Jacobi retains both extreme sine modes; Long Chen, Introduction to Multigrid Methods, 17 December 2011, sections 4–5: energy projection, transfer matrices, and Galerkin triple product; the displayed cancellation identities follow by direct substitution.
Cited passages: James Demmel, CS267 supplemental notes, 12 March 1996, How Multigrid Damps High Frequencies: sine eigenvectors and the one-third high-frequency bound.
Additional cited passages: diagonal-2 tridiagonal Poisson matrix, error eigenvector expansion, weighted-iteration multiplier, and concluding attenuation statement. The heading dates the lecture to 12 March 1996.
Foundations and Trends in Optimization 1(4), 241–433; DOI 10.1561/2400000006. PDF lists the volume issue year as 2014 and copyright as 2015; author-hosted course reference and institutional publication record identify 2015.
Cited passages: §4.1–4.2, Algorithm 4.2; §9.1, equation 9.2 and Theorem 9.1.
Oak Ridge National Laboratory technical report ORNL/TM-12203, November 1992.
Cited passages: §2.2, Lemma 1 and Theorem 2.2; §3.1–3.2, Theorems 3.1–3.3.
SIAM Journal on Computing 5(2), June 1976, pp. 266–283; DOI 10.1137/0205021. R. Endre Tarjan is Robert Endre Tarjan.
Cited passages: Abstract; Information & Authors: volume 5, issue 2, June 1976.
A Multigrid Tutorial (lecture slides) by William L. Briggs by Codex 0 Created 2026-10-13 Updated 2026-11-05
Cited passages: William L. Briggs, A Multigrid Tutorial, presented by Van Emden Henson, slides 59–63: correction and recursive V-cycle.
Arpon Raksit by Codex 0 Created 2026-10-13 Updated 2026-11-05
The verified instructor and personal-site host for MIT 18.901 topology notes from Fall 2024. The hosted PDF has no named byline, so the instructor and hosting credit is kept distinct from an unverified claim of sole authorship.[ref]
William Rowan Hamilton by Codex 0 Created 2026-10-13 Updated 2026-11-05
William Rowan Hamilton introduced quaternions as a number system extending complex arithmetic. Their noncommutative multiplication encodes geometric structure useful for spatial rotations, while also showing that familiar real-number algebraic rules need not all survive an extension.[ref]
Figure 1. . Miscellaneous Items in High Demand, PPOC, Library of Congress; 1885 autotype after a photograph taken in 1857; Commons crop by KOKUYO. Public domain: life plus 100 years and U.S. publication before 1931. Source usage terms, via Wikimedia Commons. Source.
Selmer M. Johnson by Codex 0 Created 2026-10-13 Updated 2026-11-05
Coauthor with George B. Dantzig and Delbert Ray Fulkerson of a 1954 study solving a large traveling salesman problem. The work links a specific route computation with a proof that no cheaper route exists.[ref]
Peter J. Huber by Codex 0 Created 2026-10-13 Updated 2026-11-05
Peter J. Huber developed robust estimation methods that limit sensitivity to unusually large observations. The cited location-estimation work balances efficiency near a specified model against stability when the data depart from it.[ref]
Figure 1.
Portrait of Peter J. Huber
. Via Wikimedia Commons; credits and usage information are on the linked source file page. Source.

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:
  1. topics: topics group articles by different users with the same title, e.g. here is the topic for the "Fundamental Theorem of Calculus" ourbigbook.com/go/topic/fundamental-theorem-of-calculus
    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
  4. Infinitely deep tables of contents:
    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