A degree-constrained spanning tree (DCST) is a specific type of spanning tree in a graph with the additional restriction that the degree (i.e., the number of edges connected) of each vertex must not exceed a specified limit. In other words, a DCST is a tree that spans all the vertices of a graph while ensuring that no vertex has a degree greater than a predefined upper bound.
The Kinetic Minimum Spanning Tree (KMST) is a concept derived from dynamic graph algorithms, specifically focusing on the minimum spanning tree (MST) in scenarios where the graph changes over time. In a typical minimum spanning tree problem, you have a weighted, undirected graph, and the goal is to find a tree that spans all vertices while minimizing the total edge weight. When the edges or weights of a graph change dynamically, maintaining an efficient representation of the minimum spanning tree becomes challenging.
Multiple Spanning Tree Protocol (MSTP) is a network protocol used in Ethernet networks to prevent loops in network topologies while allowing for the efficient redundancy and load balancing of the network. Specifically, MSTP is an extension of the Spanning Tree Protocol (STP) and Multiple Spanning Tree Protocol (MSTP) to work across multiple VLANs (Virtual Local Area Networks).
A Rectilinear Minimum Spanning Tree (RMST) is a specific type of minimum spanning tree that is defined in a rectilinear (or grid-like) space, where the coordinates are aligned with the axes of a Cartesian plane. In a rectilinear geometry, the distance between two points is measured using the Manhattan distance (also known as the L1 distance), which is calculated as the sum of the absolute differences of their Cartesian coordinates.
The term "Tornado family" can refer to a few different contexts, but it most commonly pertains to either: 1. **Meteorology**: In meteorological terms, a "Tornado family" often describes a series of tornadoes that occur within the same storm system or weather event. Tornadoes can sometimes form in succession or in the same geographic area during a severe weather outbreak, and these may be referred to as part of a "family" because they share similar characteristics and conditions.
An Apollonian network is a type of geometric network that is constructed using a recursive process based on the properties of triangular tiling. It begins with a single triangle, which is then subdivided into smaller triangles recursively. The network has a rich structure and exhibits fractal characteristics, making it interesting in the study of complex networks.
Kinetic triangulation is a concept from computational geometry that deals with the dynamic problem of maintaining the properties of a triangulation of a set of points in motion. Specifically, it refers to the process of efficiently updating the triangulation structure as the points in the plane change their positions over time.
A triangle mesh is a type of geometric representation commonly used in computer graphics, 3D modeling, and computational geometry. It consists of a collection of triangular faces that define a 3D shape or surface. Each triangle is typically defined by three vertices, which are points in 3D space, and the edges connecting these vertices.
The Even Circuit Theorem, often referred to in the context of graph theory and circuit design, primarily deals with the properties of circuits within graphs. While the term itself may not be universally defined across all disciplines, it is likely related to concepts in electrical engineering and theoretical computer science, where circuits can be represented as graphs. In general terms, in a graph: - A circuit (or cycle) is a closed path where no edges are repeated.
The Geiringer–Laman theorem is a result in the field of graph theory and combinatorial geometry, specifically concerning the rigidity of frameworks. The theorem provides a criterion for determining when a certain kind of graph, known as a "framework", can be considered rigid, meaning that its vertices cannot be moved without distorting the distances between them.
The Planar Separator Theorem is a concept in computational geometry and graph theory which states that for any planar graph, it is possible to partition the vertices of the graph into three disjoint sets: X, Y, and S. The sets have the following properties: 1. **Small Separator Size**: The size of the set S (the separator) is proportional to the square root of the number of vertices in the graph.
Wagner's theorem is a result in graph theory that provides a characterization of planar graphs. Specifically, it states that a graph is planar if and only if it does not contain a subgraph that is a subdivision of the complete graph \( K_{5} \) (the complete graph on five vertices) or a subdivision of the complete bipartite graph \( K_{3,3} \) (the complete bipartite graph with three vertices in each part).
Here’s a list of some notable star systems located within the distance range of 55 to 60 light-years from Earth: 1. **Luyten 726-8** (also known as **GJ 725**) - This binary system contains two red dwarf stars, Luyten 726-8A and Luyten 726-8B.
Covering space by Ciro Santilli 40 Updated 2025-07-16
Basically it is a larger space such that there exists a surjection from the large space onto the smaller space, while still being compatible with the topology of the small space.
We can characterize the cover by how injective the function is. E.g. if two elements of the large space map to each element of the small space, then we have a double cover and so on.
Argumentation theory is a multidisciplinary field that studies the structure, content, and dynamics of arguments, focusing on how they are constructed, understood, and evaluated. It draws from various fields, including philosophy, linguistics, communication, artificial intelligence, and law. Key aspects of argumentation theory include: 1. **Structure of Arguments**: Examination of the components that make up an argument, such as premises, conclusions, and inferential connections.
Manifold by Ciro Santilli 40 Updated 2025-07-16
We map each point and a small enough neighbourhood of it to , so we can talk about the manifold points in terms of coordinates.
Does not require any further structure besides a consistent topological map. Notably, does not require metric nor an addition operation to make a vector space.
Manifolds are cool. Especially differentiable manifolds which we can do calculus on.
A notable example of a Non-Euclidean geometry manifold is the space of generalized coordinates of a Lagrangian. For example, in a problem such as the double pendulum, some of those generalized coordinates could be angles, which wrap around and thus are not euclidean.
Covariant derivative by Ciro Santilli 40 Updated 2025-07-16
A generalized definition of derivative that works on manifolds.
TODO: how does it maintain a single value even across different coordinate charts?

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