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1First uncountable ordinal is regularfirst-uncountable-ordinal-is-regular2026-10-032026-10-03
1Curvatures of a parametrized surface of revolutioncurvatures-of-a-parametrized-surface-of-revolution2026-10-032026-10-03
1Higman criterion for finite representation type of a group algebrahigman-criterion-for-finite-representation-type-of-a-group-algebra2026-10-032026-10-03
1Characteristic diamond for speed one minus y squaredcharacteristic-diamond-for-speed-one-minus-y-squared2026-10-032026-10-03
1Galois group of a finite field extensiongalois-group-of-a-finite-field-extension2026-10-032026-10-03
1Nine-point finite-difference stencilnine-point-finite-difference-stencil2026-10-032026-10-03
1Direct system of abelian groupsdirect-system-of-abelian-groups2026-10-032026-10-03
1Redundant operatorredundant-operator2026-10-032026-10-03
1Chosen-square attack on Rabin authenticationchosen-square-attack-on-rabin-authentication2026-10-032026-10-03
1Monotonicity of the normalized extremal numbermonotonicity-of-the-normalized-extremal-number2026-10-032026-10-03
1Expected utility of a Gaussian location-scale familyexpected-utility-of-a-gaussian-location-scale-family2026-10-032026-10-03
1Euler proof that the sum of reciprocals of primes divergeseuler-proof-that-the-sum-of-reciprocals-of-primes-diverges2026-10-032026-10-03
1K-mixingk-mixing2026-10-032026-10-03
1Entropy of a finite measurable partitionentropy-of-a-finite-measurable-partition2026-10-032026-10-03
1Convergence in density of a sequenceconvergence-in-density-of-a-sequence2026-10-032026-10-03
1Upper Banach densityupper-banach-density2026-10-032026-10-03
1Finite-dimensional equivalence of normsfinite-dimensional-equivalence-of-norms2026-10-032026-10-03
1Epsilon-recursion theoremepsilon-recursion-theorem2026-10-032026-10-03
1Reduced positive definite binary quadratic forms of discriminant minus thirty-fivereduced-positive-definite-binary-quadratic-forms-of-discriminant-minus-thirty-five2026-10-032026-10-03
1Pointwise vanishing derivative criterion for a polynomialpointwise-vanishing-derivative-criterion-for-a-polynomial2026-10-032026-10-03

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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!
Video 1.
Intro to OurBigBook
. Source.
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
    Video 2.
    OurBigBook Web topics demo
    . Source.
  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 2.
    You can publish local OurBigBook lightweight markup files to either OurBigBook.com or as a static website
    .
    Figure 3.
    Visual Studio Code extension installation
    .
    Figure 4.
    Visual Studio Code extension tree navigation
    .
    Figure 5.
    Web editor
    . 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.
    Video 4.
    OurBigBook Visual Studio Code extension editing and navigation demo
    . Source.
  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
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