Depth of a quantum circuit by Ciro Santilli 37 Updated +Created
This is an important metric, because it takes some time for the quantum operations to propagate, and so the depth of a circuit gives you an idea of how long the coherence time a hardware needs to support a given circuit.
Design pattern by Ciro Santilli 37 Updated +Created
Desktop computer by Ciro Santilli 37 Updated +Created
Bobblehead by Wikipedia Bot 0
A bobblehead is a type of collectible doll or figurine characterized by a oversized head that is attached to a spring or a flexible joint, allowing the head to bobble or nod when moved or shaken. Typically, bobbleheads are designed to resemble specific characters, celebrities, athletes, or even fictional characters.
Determinant by Ciro Santilli 37 Updated +Created
Name origin: likely because it "determines" if a matrix is invertible or not, as a matrix is invertible iff determinant is not zero.
Developmental genetics by Ciro Santilli 37 Updated +Created
How genes form bodies.
Video 1.
Developmental Genetics 1 by Joseph Ross (2020)
Source. Talks about homeobox genes.
Diagonal matrix by Ciro Santilli 37 Updated +Created
Diaphragm (optics) by Ciro Santilli 37 Updated +Created
China doll by Wikipedia Bot 0
The term "China doll" can refer to a couple of different things, depending on the context: 1. **Porcelain Doll**: A "China doll" is often a type of doll made from porcelain or china, characterized by its delicate features, painted facial expressions, and sometimes intricate clothing. These dolls have been popular collectibles, especially in the 19th and early 20th centuries. They are known for their fragile nature and often depict various historical or cultural themes.
Differentiable manifold by Ciro Santilli 37 Updated +Created
TODO find a concrete numerical example of doing calculus on a differentiable manifold and visualizing it. Likely start with a boring circle. That would be sweet...
Diffraction grating by Ciro Santilli 37 Updated +Created
Diffraction of light by Ciro Santilli 37 Updated +Created
Digital currency by Ciro Santilli 37 Updated +Created
Composition doll by Wikipedia Bot 0
A composition doll is a type of doll that is made from a composite material, typically a blend of wood pulp, sawdust, and other organic materials, which are then mixed with a binding agent and molded into shape. This type of doll was popular during the early to mid-20th century, especially from the 1900s to the 1950s. Composition dolls were often less expensive than porcelain dolls and were lighter, making them more appealing to children.
Digital micromirror device by Ciro Santilli 37 Updated +Created
Video 1.
The Insane Engineering of DLP by Zack Freedman (2022)
Source.
Digital signal processing by Ciro Santilli 37 Updated +Created

Pinned article: ourbigbook/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