The square root of 2 is an irrational number approximately equal to 1.41421356237. It is often represented as √2. This value cannot be expressed as a simple fraction, and its decimal representation goes on infinitely without repeating.
The "Sophomore's Dream" is a term used in mathematics, particularly in the context of number theory. It refers to a specific type of mathematical problem or equation related to the sums of squares and their properties. More specifically, it describes the scenario where a number can be expressed as the sum of two squares in more than one way.
The Silver Ratio is a mathematical constant that arises from the context of continuous fractions and geometric constructions, analogous to the more commonly known Golden Ratio. It is defined as: \[ \delta_S = 1 + \sqrt{2} \approx 2.41421...
Schnirelmann density, named after the Russian mathematician L. L. Schnirelmann, is a concept in additive number theory that quantifies how "thick" a subset of the natural numbers is. In simple terms, it is a way to measure how much of the natural numbers can be "covered" by a given set.
The Ramanujan–Soldner constant is a mathematical constant denoted by the symbol \( L \) and is approximately equal to \( 0.781072... \). It is defined as the unique positive root of the logarithmic integral function \( \text{Li}(x) = 0 \).
The Omega constant, denoted by the symbol \( \Omega \), is a special number that is defined as the unique positive real solution to the equation \[ x = e^{-x}. \] This equation can also be written as: \[ x e^x = 1, \] which means that \( \Omega \) is related to the Lambert W function, specifically the principal branch \( W_0 \).
The natural logarithm of 2, denoted as \(\ln(2)\), is approximately equal to 0.693147. This value represents the power to which the base \(e\) (approximately 2.71828) must be raised to obtain the number 2.
The Meissel–Mertens constant, often denoted as \( M \), is a mathematical constant that arises in number theory, particularly in the study of prime numbers and the distribution of primes.
A mathematical constant is a fixed, well-defined number that is significant in mathematics. Unlike variables, which can change values, constants remain the same. They often arise in various mathematical contexts and can represent fundamentally important quantities. Examples of widely known mathematical constants include: 1. **Pi (\( \pi \))**: Approximately equal to 3.14159, it represents the ratio of the circumference of a circle to its diameter.
The "magic angle" is a term used primarily in the context of nuclear magnetic resonance (NMR) spectroscopy and solid-state NMR. It refers to a specific angle, approximately 54.74 degrees (or arccos(1/√3)), at which the anisotropic interactions in a solid sample can be effectively averaged out. This is particularly relevant for studying solid materials where the molecular orientations can lead to broadening of NMR signals.
The MRB constant, or the Molar Reference Boiling point constant, is a value used in thermodynamics and physical chemistry to describe the boiling point of substances at a standard pressure, typically 1 atmosphere. It is particularly relevant for understanding the behavior of substances during phase transitions and in the context of calculations involving colligative properties.
The Lemniscate constant, often denoted by the symbol \( L \), is a mathematical constant that arises in connection with the geometry of the lemniscate, a figure-eight shaped curve.
The Landau–Ramanujan constant, usually denoted as \( g \), is a mathematical constant that arises in the context of the theory of numbers, particularly in relation to the asymptotic density of square-free integers. It is named after mathematicians Edmund Landau and Srinivasa Ramanujan.
The Komornik–Loreti constant, denoted as \(C\), is a mathematical constant that arises in the context of number theory and dynamical systems. It is defined as the unique positive root of the polynomial equation: \[ x^2 = 2^{\beta} x + 1 \] where \(\beta\) is a specific parameter, typically equal to \(\log_2(3)\).
The Hermite constant is a mathematical concept in the field of number theory and geometry, particularly in relation to lattices in Euclidean spaces.
The Gelfond–Schneider constant is a mathematical constant denoted by \( e^{\sqrt{2}} \). It is named after the mathematicians Aleksandr Gelfond and Reinhold Schneider, who proved its transcendental nature.
Gelfond's constant, denoted as \( G \), is a transcendental number defined as: \[ G = 2^{\sqrt{2}} \] It is named after the Russian mathematician Aleksandr Gelfond, who, along with Theodor Schneider, proved that \( G \) is transcendental in 1934. A transcendental number is a number that is not a root of any non-zero polynomial equation with rational coefficients.
The mathematical constant \( e \) is approximately equal to 2.71828 and is the base of the natural logarithm. It is an important constant in mathematics, particularly in calculus and complex analysis, because it has many interesting properties.
The Dottie number is defined as the unique fixed point of the function \( f(x) = \cos(x) \). This means that when you compute \( f(x) \) and set it equal to \( x \) (i.e., \( x = \cos(x) \)), the value of \( x \) that satisfies this equation is known as the Dottie number. The Dottie number is approximately equal to 0.7390851332151607.

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 5. . 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.
  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