Homological dimension is a concept from homological algebra that measures the "size" or "complexity" of an object in terms of its projective or injective resolutions. It provides a way to classify objects in terms of their relationships with projective and injective modules, often in the context of modules over rings or sheaves over topological spaces.
Lattice Miner is a software tool often used for data mining and analysis, particularly focused on lattice-based data structures. It typically helps users discover patterns, relationships, and insights within large datasets. The concept of a lattice in mathematics refers to a structured way to represent relationships among a set of items, enabling efficient querying and exploration of data. Lattice Miner can be applied in various domains, including: - **Association Rule Mining:** It can identify items that frequently co-occur in transactional databases.
A tolerance relation is a concept in mathematics, particularly in the field of topology and in certain areas of set theory and algebra. It serves as a generalization of the notion of an equivalence relation, but with some flexibility regarding the properties of the elements involved.
Harish-Chandra's Schwartz space, denoted often as \(\mathcal{S}(G)\), is a particular function space associated with a semisimple Lie group \(G\) and its representation theory. This space consists of smooth functions that possess specific decay properties.
The second moment method is a technique in probability theory and combinatorics often used to prove the existence of certain properties of random structures, typically applied in probabilistic combinatorics and random graph theory. This method leverages the second moment of a random variable to provide bounds on the probability that the variable takes on a certain value or exceeds a certain threshold.
The Jacquet module is a concept from representation theory and has its roots in the theory of automorphic forms. It is primarily associated with the study of representations of reductive groups over local or global fields, particularly in the context of Maass forms, automorphic representations, and the theory of the Langlands program.
Parabolic induction is a method used in representation theory, particularly in the study of reductive Lie groups and their representations. It is a technique that allows one to construct representations of a group from representations of its parabolic subgroups. This method is particularly helpful in understanding the representation theory of larger groups by breaking it down into more manageable pieces.
The Plancherel measure arises in the context of harmonic analysis and representation theory, particularly concerning the study of groups and their representations. It is associated with the decomposition of functions or signals into orthogonal basis elements, similar to how Fourier transforms are used for functions on the real line. In a more specific sense, the Plancherel measure is used in the context of the representation theory of locally compact groups.
A finite ring is a ring that contains a finite number of elements. In abstract algebra, a ring is defined as a set equipped with two binary operations: addition and multiplication, which satisfy certain properties. Specifically, a ring must satisfy the following axioms: 1. **Additive Identity**: There exists an element \(0\) such that \(a + 0 = a\) for all elements \(a\) in the ring.
In ring theory, a branch of abstract algebra, a **reduced ring** is a type of ring in which there are no non-zero nilpotent elements. A nilpotent element \( a \) in a ring \( R \) is defined as an element such that for some positive integer \( n \), \( a^n = 0 \). In simpler terms, if \( a \) is nilpotent, then raising it to some power eventually results in zero.
The Nambooripad order, also known as the Namboodiri order, refers to a historically significant social and religious system associated with the Nambudiri community in Kerala, India. The Nambudiris are a Hindu Brahmin community notable for their unique customs and practices. Key features of the Nambooripad order include: 1. **Patriarchal Structure**: The Nambudiri social system is characterized by a strong patriarchal structure.
Fréchet algebras are a type of mathematical structure that arise in functional analysis, particularly in the study of topological vector spaces. A Fréchet algebra is a particular kind of algebra that is also a Fréchet space, highlighting the interplay between algebraic properties and topological considerations.
In mathematics, particularly in the fields of topology, algebra, and lattice theory, a **closure operator** is a function that assigns a subset (the closure) to every subset of a given set, satisfying certain axioms. A closure operator \( C \) on a set \( X \) must satisfy the following three properties: 1. **Extensiveness**: For every subset \( A \subseteq X \), \( A \subseteq C(A) \).
The concept of completeness in the context of atomic initial sequents is primarily discussed in the realm of formal logic and proof theory, particularly in relation to sequent calculi, which are systems used for representing logical deductions. **Atomic Initial Sequents** refer specifically to sequents that consist of atomic formulas only. A sequent generally has the form \( A_1, A_2, ..., A_n \vdash B \), where the formulas \( A_1, A_2, ...
The Rice–Shapiro theorem, often referred to as Rice's theorem in the context of computability theory, is a fundamental result concerning the properties of recursively enumerable (r.e.) sets and the functions computable by Turing machines. In its standard form, Rice's theorem states that any non-trivial property of the languages recognized by Turing machines is undecidable.
Suicide bidding is a term used in auction contexts, particularly in online advertising or industrial procurement, where a bidder intentionally submits a low bid to disrupt market conditions or to lower the average bid price. The goal can vary; for instance, a bidder might aim to create a situation where others also lower their bids, hoping to win the auction at a lower cost. In some cases, this practice can be seen as unethical because it undermines fair competition.
Facility location in the context of cooperative game theory refers to a problem where a set of players (which could represent companies, individuals, or organizations) aim to choose locations for facilities (such as warehouses, stores, or service centers) to optimize certain objectives like minimizing costs, maximizing service quality, or balancing resources. In a cooperative game setting, players can form coalitions to collectively make decisions that benefit all members involved.
"Irrigation" is a type of puzzle or simulation game that typically involves managing water resources to effectively irrigate crops and maximize agricultural output. The primary goal is usually to create a network of irrigation channels that deliver water to fields while overcoming various challenges such as terrain obstacles, limited resources, and time constraints. In these games, players often have to strategically plan and construct irrigation systems, considering factors like water flow, planting schedules, and crop types.

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