The Three-twist knot, also known as the trefoil knot, is one of the simplest and most well-known types of nontrivial knots in topology. It can be visualized as a loop with three twists in it, and it is often represented as a closed curve that can be drawn in three-dimensional space without self-intersecting, yet cannot be untangled into a simple loop without cutting it.
A twist knot, also known as a twisted knot, is a type of knot characterized by the intertwining of two or more strands. This type of knot can be used in various applications, including climbing, boating, crafting, and more. The twisting action creates friction, which helps secure the knot. Twist knots can vary in complexity and construction, with some being relatively simple and others more intricate.
Self-duality is a concept that appears in various fields, including mathematics, physics, and computer science. Its precise definition and implications can vary depending on the context. 1. **Mathematics**: In the context of geometry and topology, a self-dual object is one that is isomorphic to its dual.
Klaas de Boer is a Dutch astronomer known for his contributions to the field of astronomy, particularly in relation to the study of the solar system, planetary science, and exoplanets. While specific details about his research or achievements may vary and not be widely publicized, he is recognized within the scientific community for his work.
"Dutch bioinformaticians" refers to bioinformaticians who are from the Netherlands or are associated with Dutch institutions. Bioinformaticians are professionals who use computational tools and methods to analyze biological data, particularly in the fields of genomics, proteomics, and other areas of molecular biology. In the Netherlands, there is a strong emphasis on research and development in bioinformatics, supported by various universities, research institutes, and biotech companies.
The Hodge star operator is a mathematical operator used extensively in differential geometry and algebraic topology, particularly in the context of differential forms on Riemannian manifolds. It acts on differential forms and is used to relate forms of different degrees.
Seiberg duality is a powerful theoretical concept in quantum field theory and string theory, named after Nathan Seiberg, who introduced it in the context of supersymmetric gauge theories. It reveals interesting dualities between certain types of supersymmetric gauge theories, effectively showing that two seemingly different theories can describe the same underlying physics.
"BRANE" can refer to different things depending on the context: 1. **In Physics and String Theory**: A "brane" (short for "membrane") is a fundamental object in string theory and related theories such as M-theory. Branes can exist in various dimensions, and they can have various properties. For example, a 1-brane is a string, a 2-brane is a surface, and so on.
Betty Paërl is a digital content creator known for her presence on platforms like YouTube and Instagram, where she shares lifestyle, beauty, and fashion-related content. She often provides makeup tutorials, skincare tips, and personal vlogs. Besides her online presence, she may also be involved in collaborations with brands or other influencers in the beauty and fashion industry.
The Brauer–Fowler theorem is a result in the field of group theory, more specifically in the study of linear representations of finite groups. It deals with the structure of certain finite groups and their representations over fields with certain characteristics.
Kummer varieties are algebraic varieties associated with abelian varieties, specifically focusing on the quotient of a complex torus that arises from abelian varieties. More precisely, a Kummer variety is constructed from an abelian variety by identifying points that are negatives of each other.
The Kurosh problem, named after the Iranian mathematician Alexander Kurosh, is a well-known problem in group theory, particularly in the context of the structure of groups and their subgroups. The Kurosh problem concerns the characterization of a certain type of subgroup, namely, free products of groups.
Congruence-permutable algebras are a class of algebras studied in universal algebra and related fields. An algebraic structure is generally described by a set along with a collection of operations and relations defined on that set. The concept of congruences in algebra refers to certain equivalence relations that respect the operations of the algebra.
Idempotent analysis is a branch of mathematics and theoretical computer science that extends the concepts of traditional analysis using the framework of idempotent semirings. In idempotent mathematical structures, the operation of addition is replaced by a max operation (or another specific operation depending on the context), and the operation of multiplication remains similar to standard multiplication.
Naimark equivalence is a concept in functional analysis and operator theory that relates to the representation of certain kinds of operator algebras, specifically commutative C*-algebras. The concept is named after the mathematician M.A. Naimark.
A supersolvable group is a type of group in the field of group theory, a branch of mathematics. A group \( G \) is said to be supersolvable if it has a normal series where each factor group is cyclic of prime order.
In group theory, a **weakly normal subgroup** is a concept that generalizes the notion of a normal subgroup. A subgroup \( H \) of a group \( G \) is considered weakly normal if it is invariant under conjugation by elements of a "larger" set than just the group itself.
Arseny Mironov could refer to a person, but as of my last update in October 2023, there is no widely recognized individual by that name in global news, sports, entertainment, or any other notable field. It’s possible that he could be a private individual or someone increasing in prominence after my last update.
Borys Paton was a prominent Ukrainian scientist, engineer, and academic known for his significant contributions to the fields of welding and materials science. Born on November 27, 1918, and passing away on January 19, 2022, Paton served as the president of the National Academy of Sciences of Ukraine and led the Paton Electric Welding Institute in Kyiv, which is named in his honor.
Aleksandr Kaleri is a Russian former cosmonaut. He was born on January 24, 1956, in the city of Kresty, Russia. Kaleri flew on four spaceflights, participating in various missions to the Russian space station Mir and the International Space Station (ISS). Throughout his career, he has accumulated significant experience in space exploration, conducting experiments and contributing to scientific research in microgravity environments.

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 2.
    You can publish local OurBigBook lightweight markup files to either https://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