A gammoid is a specific type of mathematical structure used in graph theory and combinatorial optimization. More formally, a gammoid is a type of directed graph that can be represented in terms of a certain set of vertices and directed edges, whereby subsets of vertices correspond to particular properties regarding the acyclic nature of the graph and the connectivity of its components. Gammoids can be interpreted through the lens of matroid theory, where they relate to the notion of strong connectivity and directed paths.
HyCOM, or Hybrid Coordinate Ocean Model, is a type of oceanographic numerical model designed to simulate ocean circulation and dynamics. It utilizes a hybrid coordinate system that combines aspects of both Cartesian (grid-based) and sigma (depth) coordinates, allowing for more accurate representation of ocean processes across varying depths and regions. HyCOM is particularly useful for studying ocean currents, temperature distribution, sea surface height, and other key oceanographic variables.
The term "geostationary ring" refers to a specific region in space around Earth where satellites can maintain a geostationary orbit. A geostationary orbit is one in which a satellite's orbital period matches the Earth's rotation period, allowing the satellite to remain fixed over a specific point on the Earth's surface.
The ear canal, also known as the external auditory canal or external acoustic meatus, is a tubular structure that connects the outer ear to the middle ear. It plays a crucial role in the auditory system by directing sound waves from the external environment to the eardrum (tympanic membrane). The ear canal is typically about 2.5 centimeters (1 inch) long in adults and is lined with skin that contains glands that produce earwax (cerumen).
Astronomers are scientists who study astronomy, the scientific field that focuses on celestial objects, phenomena, and the universe as a whole. They analyze the properties, behavior, and interactions of planets, stars, galaxies, and other astronomical entities, using both theoretical models and observational data. Astronomers may specialize in various subfields, such as: - **Astrophysics**: Studying the physical properties and processes of celestial objects.
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!
Intro to OurBigBook
. Source. We have two killer features:
- 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-calculusArticles 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/derivativeVideo 2. OurBigBook Web topics demo. Source. - 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.
- to OurBigBook.com to get awesome multi-user features like topics and likes
- as HTML files to a static website, which you can host yourself for free on many external providers like GitHub Pages, and remain in full control
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. 
- Infinitely deep tables of contents:
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