Heinrich von Wild (often referred to as Heinrich Wild or just Wild) is primarily known in the context of the watchmaking industry. He was a Swiss watchmaker and the founder of the Wild company, which gained recognition for producing high-quality timepieces and watch movements. The brand has a reputation for precision and craftsmanship, contributing to the legacy of Swiss watchmaking.
Paul Scherrer Institute (PSI) is a research institute located in Switzerland. It specializes in the fields of materials science, condensed matter physics, and energy research, among others. The institute is well-known for its large facilities, including particle accelerators and neutron sources, which are used for advanced research in various scientific disciplines. The PSI collaborates with universities, research institutions, and industries both in Switzerland and internationally to contribute to scientific advancements and technological innovations.
Thomas Tommasina is the stage name of an emerging artist and musician known for his original music, particularly in the pop or indie genre. His work often features a blend of catchy melodies and relatable lyrics. Additionally, he may have a presence on social media platforms where he engages with fans and shares updates about his music career.
A Markov partition is a specific type of partitioning of a dynamical system that is used in the study of dynamical systems, particularly those that exhibit chaotic behavior. It is closely related to concepts in ergodic theory and symbolic dynamics.
Gauge symmetry is a crucial concept in both mathematics and physics, particularly in the context of gauge theories in physics such as electromagnetism and the Standard Model of particle physics. In mathematics, gauge symmetry refers to certain types of symmetries of fields and the associated mathematical structures. ### Key Components of Gauge Symmetry: 1. **Fields and Potentials**: In gauge theories, physical quantities like electromagnetic or gravitational fields can be represented by fields (functions over space and time).
Jay Hambidge (1867–1924) was an American architect and theorist known for his work in the field of visual design, particularly in relation to the use of mathematical proportions in art and architecture. He is best known for developing the concept of "Dynamic Symmetry," which is a method of composition based on geometric principles, particularly the use of the rectangle and its subdivisions.
A **P-compact group** (or **p-compact group**) is a type of topological group that plays a significant role in algebraic topology and group theory. These groups generalize the notion of compact groups, which are topological groups that are compact as topological spaces, but allow for more general structures.
A regular polytope is a multi-dimensional geometric figure that is highly symmetrical, with identical shapes and arrangements in its structure. In general, a regular polytope can be defined as a convex polytope that is both uniform (its faces are the same type of regular polygon) and vertex-transitive (the structure looks the same from any vertex).
A triskelion, also known as a triskeles or triplex, is an ancient symbol consisting of three interlocked spirals or three bent human legs. The design is typically arranged in a rotating pattern, which can symbolize motion and progress.
Microlinguistics is a subfield of linguistics that focuses on the smaller, more detailed aspects of language. It typically examines the internal structures and components of individual languages, such as phonetics, phonology, morphology, syntax, and semantics. Key areas of study within microlinguistics include: 1. **Phonetics and Phonology**: The study of sounds in human speech and the rules governing their organization and use.
The term "nearest referent" is often used in the context of linguistics, semantics, and discourse analysis. It refers to the closest entity or concept that a pronoun, demonstrative, or other referring expression points to within a given context.
Phrase structure rules, also known as rewrite rules, are a set of formal grammatical rules used in generative grammar to describe the structure of phrases and sentences in a language. These rules define how symbols (which can represent words, phrases, or other grammatical constructs) can be combined to form larger grammatical units. The basic idea is that phrases can be generated from smaller constituents based on these rules.
Dubnium is a synthetic chemical element with the symbol Db and atomic number 105. It is named after Dubna, a town in Russia where the Joint Institute for Nuclear Research is located, and where the element was first synthesized in 1968 by a team of Russian and American scientists. Dubnium is a member of the actinide series, and it is placed in the d-block of the periodic table's group 5, which makes it part of the transition metals.
Lawrencium is the chemical element with the symbol Lr and atomic number 103. It is classified as a synthetic element and belongs to the actinide series of the periodic table. Lawrencium was first synthesized in 1961 by a team of scientists at the University of California, Berkeley, and it was named in honor of Ernest O. Lawrence, the inventor of the cyclotron.
Atom by Ciro Santilli 40 Updated 2025-07-16
Theory that atoms exist, i.e. matter is not continuous.
Much before atoms were thought to be "experimentally real", chemists from the 19th century already used "conceptual atoms" as units for the proportions observed in macroscopic chemical reactions, e.g. . The thing is, there was still the possibility that those proportions were made up of something continuous that for some reason could only combine in the given proportions, so the atoms could only be strictly consider calculatory devices pending further evidence.
Subtle is the Lord by Abraham Pais (1982) chapter 5 "The reality of molecules" has some good mentions. Notably, physicists generally came to believe in atoms earlier than chemists, because the phenomena they were most interested in, e.g. pressure in the ideal gas law, and then Maxwell-Boltzmann statistics just scream atoms more loudly than chemical reactions, as they saw that these phenomena could be explained to some degree by traditional mechanics of little balls.
Confusion around the probabilistic nature of the second law of thermodynamics was also used as a physical counterargument by some. Pais mentions that Wilhelm Ostwald notably argued that the time reversibility of classical mechanics + the second law being a fundamental law of physics (and not just probabilistic, which is the correct hypothesis as we now understand) must imply that atoms are not classic billiard balls, otherwise the second law could be broken.
Pais also mentions that a big "chemical" breakthrough was isomers suggest that atoms exist.
Very direct evidence evidence:
Less direct evidence:
Subtle is the Lord by Abraham Pais (1982) page 40 mentions several methods that Einstein used to "prove" that atoms were real. Perhaps the greatest argument of all is that several unrelated methods give the same estimates of atom size/mass:
The Pearson distribution, or Pearson system of distributions, is a family of continuous probability distributions that are defined based on moments, especially how the shape of the distribution is determined by its moments (mean, variance, skewness, and kurtosis). This system was introduced by Karl Pearson in the early 20th century, and it encompasses a wide range of probability distributions, including the normal distribution, beta distribution, and skewed distributions.
Edward H. Sussenguth was a renowned American marine biologist, particularly recognized for his work in the field of ichthyology, the study of fish. He significantly contributed to our understanding of fish taxonomy and ecology, particularly in the Atlantic Ocean. Sussenguth's research included extensive studies on the life histories and populational dynamics of various fish species. His work is important for both academic research and practical applications in fisheries management and conservation.
As of my last knowledge update in October 2023, Narayanan Chandrakumar does not appear to be a widely recognized figure in public records or notable databases. It’s possible that he could be an emerging public figure, a private individual, or associated with a specific academic, professional, or cultural context that is not broadly documented.
Gaussian units refer to a system of units used in electromagnetism, which is based on the Gaussian system of measurements. These units are a special case of the cgs (centimeter-gram-second) system, and they are primarily used in theoretical physics, particularly in the context of classical electrodynamics. In the Gaussian system: - The fundamental units are the centimeter (cm) for length, gram (g) for mass, and second (s) for time.
The IBM 7340 is a model of a magnetic tape drive that was part of IBM's line of storage devices. It was designed for use with IBM mainframe computers and other compatible systems during the mid-20th century. The IBM 7340 was known for its ability to read and write data on magnetic tape, providing an efficient means of data storage and retrieval at the time.

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