Annals of Mathematics 48(2), 290–320. Primary publisher record: www.jstor.org/stable/1969172 . Original paper introducing cochain constructions underlying the mod-two cohomology operations. Full publisher text was inaccessible; bibliographic record and later primary mathematical expositions identify the contribution.
Primary work in French translation. Propositions I and III give the circle-area relation and the rational circumference-to-diameter bounds 223/71 and 22/7. Indexed translated text inspected; direct fetching returned 403.
Edited in modern notation by Thomas Little Heath, Cambridge University Press, 1896. Primary translated/adapted Conics text; the edition rearranges the ancient work. Cited passage: Book I, conic sections and their defining geometric relations.
Course lecture text. Definitions1.3–1.4 specify the k-space and weak Hausdorff conventions; section2, Lemmas2.1–2.2, defines the kified product and its universal property.
Author lecture text, based on a Hamburg 2003 course. Sections 11 and 13 give the Ricci form and Kähler–Einstein equation; sections 7 and 17 discuss projective and Ricci-flat examples.
The symplectic-sum construction glues along codimension-two symplectic submanifolds with identified opposite normal bundles. The publisher abstract verifies the resulting realization of finitely presented groups in every even dimension at least four. For the local gluing model and normal-bundle conditions, the Auroux–Smith lectures give a complementary primary exposition.
Based on CIME lectures in Cetraro, September 2003. Sections 1–2: symplectic background, Lefschetz pencils and fibrations, local models, blowup of base points, and algebraic generic pencils. The date on the consulted arXiv version is 4 January 2004; this is distinct from the later published chapter.
Publications Mathématiques de l’IHÉS 5, pages 5–64. DOI: doi.org/10.1007/BF02684746
Final section, pages 63–64, especially Satz 5: local freeness and bijective fiber-cohomology comparison under constant fiber dimension; Satz 6 records Euler-characteristic constancy under flatness and a reduced connected base. Indexed original passages were read; direct PDF fetching timed out. Archive metadata identifies a later correction, which should be retained alongside the original bibliographic record.
Appendix A, pages 119–121 in the displayed text (PDF pages 119–121): fractional densities, their product and integration, and the intrinsic Hilbert space obtained by completing compactly supported half-densities. The preface identifies courses in 1992 and 1994; no publication year inferred from those course dates.
Sections 1.1–1.3: plurigenera and birational invariance; Definition 1.2.1 and Proposition 1.2.4, Iitaka dimension and polynomial growth along sufficiently divisible powers; Definition 1.3.1 and Examples 1.3.2–1.3.7, Kodaira dimension and curve/surface examples.
The author and course are verified by the institutional page people.math.harvard.edu/~mpopa/271/index.html; no publication year inferred.
Section 2, manuscript pp.3–5: Hesse equations, common flex/base points, normal form and Hessians. Published in L’Enseignement Mathématique 55 (2009), pp.235–273. The wiki calculations explicitly use complex coefficients to avoid small-characteristic Hessian degeneracies.
Example (I.5.1), printed p.7: resolving a pencil of plane cubics by nine blowups, the elliptic fibration and its anticanonical fibre class. The author page identifies ETS Editrice Pisa, 1989.

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