An exotic sphere is a differentiable manifold that is homeomorphic but not diffeomorphic to the standard \( n \)-dimensional sphere \( S^n \) in Euclidean space. This means that while two spaces may have the same topological structure (they can be continuously deformed into each other without tearing or gluing), they have different smooth structures (the way we can differentiate functions on them).
The Kervaire manifold, specifically the Kervaire manifold of dimension \( 2n+1 \) for \( n \geq 1 \), is a type of differentiable manifold that arises in the study of smooth structures on high-dimensional spheres and exotic \( \mathbb{R}^n \). It is named after mathematician Michel Kervaire.
The Inverse Function Theorem is a fundamental result in differential calculus that provides conditions under which a function has a differentiable inverse. It states the following: ### Statement of the Theorem: Let \( f: U \to \mathbb{R}^n \) be a function defined on an open set \( U \subseteq \mathbb{R}^n \). If: 1. \( f \) is continuously differentiable in \( U \), 2.
Milnor's sphere refers to a specific example of a manifold that was discovered by mathematician John Milnor in the 1950s. It is particularly known for being a counterexample in differential topology, specifically in the context of the classification of high-dimensional spheres. In more detail, Milnor constructed a manifold that is homeomorphic (topologically equivalent) to the 7-dimensional sphere \( S^7 \) but not diffeomorphic (smoothly equivalent) to it.
A vector field is a mathematical construct that assigns a vector to every point in a space. It can be thought of as a way to represent spatial variations in a quantity that has both magnitude and direction. Vector fields are widely used in physics and engineering to model phenomena such as fluid flow, electromagnetic fields, and gravitational fields, among others.
A **parallelizable manifold** is a differentiable manifold that has a global frame of vector fields. This means there exists a set of smooth vector fields that span the tangent space at every point of the manifold, and these vector fields can be chosen to vary smoothly. In more formal terms, a manifold \( M \) is said to be parallelizable if there exists a smooth bundle of vector fields \( \{V_1, V_2, ...
The Schoenflies problem is a question in the field of topology, specifically concerning the embedding of spheres in Euclidean spaces. It is named after the mathematician Rudolf Schoenflies. The problem essentially asks whether every simple, closed curve in three-dimensional space can be "filled in" by a disk, or in more technical terms, whether every homeomorphism of the 2-sphere (the surface of a solid ball) can be extended to a homeomorphism of the solid ball itself.
In mathematics, particularly in the field of differential geometry, a **submanifold** is a subset of a manifold that itself has the structure of a manifold, often with respect to the topology and differential structure induced from the larger manifold.
Faà di Bruno's formula provides a way to compute the \( n \)-th derivative of a composed function. It generalizes the chain rule for differentiation in a systematic way.
The term "reciprocal rule" can refer to different concepts depending on the context in which it's used. Below are a few interpretations of the term: 1. **Mathematics**: In mathematics, particularly in the context of fractions or division, the reciprocal of a number is defined as \(1\) divided by that number.
A diffraction grating is an optical component with a periodic structure that diffracts light into several beams. The grating consists of multiple closely spaced slits or grooves, which can be either reflective or transmissive. When light waves encounter the grating, they are scattered at specific angles according to the principles of wave interference, producing a spectrum of colors.
"Discoveries" by Juraj Tóth is not a widely recognized title in mainstream literature, art, or scientific fields up to my last update in October 2023. However, there may be specific niche areas or emerging works that have not gained significant attention yet. Juraj Tóth could also be involved in various domains, such as scientific research, literature, or academia.
CORDIC, which stands for COordinate Rotation DIgital Computer, is an algorithm used for calculating trigonometric functions, hyperbolic functions, exponentials, logarithms, and square roots, among other operations. It was first introduced by Volder in 1959 and has become a popular method for implementing these calculations in hardware, particularly in dedicated digital processors and embedded systems where resources are limited.
Poker video games are digital adaptations of the traditional card game of poker. These games can be played on various platforms, including personal computers, consoles, and mobile devices. They range from casual, social games where players can compete against friends and other online players to more serious simulations that mimic professional poker environments. ### Types of Poker Video Games 1. **Online Poker Rooms**: These are platforms where players can join real-money or play-money games.
Powder diffraction is a scientific technique used to analyze the crystalline structure of materials in powder form. This method is commonly employed in fields such as materials science, chemistry, geology, and metallurgy to determine the arrangement of atoms within a crystalline solid. **Key features of powder diffraction include:** 1. **Sample Requirements**: The sample must be in powder form, which allows the random orientation of crystallites.
Kinematic diffraction is a concept in the field of X-ray diffraction and crystallography that describes the way X-rays scatter off a crystalline material. It is based on kinematic theory, which simplifies the treatment of diffraction by considering the contributions of each atom in the crystal independently, without accounting for multiple scattering events. In kinematic diffraction, the following key points apply: 1. **Single Scattering**: It assumes that each X-ray photon interacts with one atom and is scattered only once.
"Bicycle Casino" is a video game that simulates the experience of gambling in a casino setting. Developed by the team behind the popular "Bicycle" card brand, the game offers players a variety of casino games, including poker, blackjack, and other classic games traditionally found in casinos. The game may feature realistic graphics, sound effects, and a user-friendly interface to immerse players in the gambling experience. It can be played on different platforms, including personal computers and gaming consoles.
Pocket Card Jockey is a uniquely designed video game that combines elements of card games with horse racing. Developed by Game Freak and published by Nintendo, it was initially released for the Nintendo 3DS in 2016. The gameplay integrates various mechanics, where players use a standard deck of playing cards to influence their horse's performance during races. In Pocket Card Jockey, players manage a stable of horses, selecting cards to affect various aspects of the race, such as speed and stamina.
The Scherrer equation is a formula used in materials science and crystallography to estimate the size of crystalline domains in a material based on X-ray diffraction data. It provides a way to quantify the average size of coherently diffracting crystallites or grains within a sample. The equation is particularly useful for nanomaterials and thin films.
Selected Area Diffraction (SAD) is a technique used in transmission electron microscopy (TEM) to analyze the crystallographic structure of materials. It allows researchers to obtain diffraction patterns from a specific area of a sample rather than from the entire specimen. This technique is particularly useful for studying the local structural properties of crystalline materials, including defects, phase composition, and orientation.
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





