Structuralism in the philosophy of mathematics is an approach that emphasizes the study of mathematical structures rather than the individual objects that make up those structures. This perspective focuses on the relationships and interconnections among mathematical entities, suggesting that mathematical truths depend not on the objects themselves, but on the structures that relate them. Key aspects of mathematical structuralism include: 1. **Structures over Objects**: Structuralism posits that mathematics is primarily concerned with the relationships and structures that can be formed from mathematical entities.
Kaifeng by Ciro Santilli 40 Updated 2025-07-16
Capital of the Northern Song dynasty. Features in Water Margin.
Brownian motion by Ciro Santilli 40 Updated 2025-07-16
Small microscopic visible particles move randomly around in water.
If water were continuous, this shouldn't happen. Therefore this serves as one important evidence of atomic theory.
The amount it moves also quantitatively matches with the expected properties of water and the floating particles, was was settled in 1905 by Einstein at: investigations on the theory of the Brownian movement by Einstein (1905).
This suggestion that Brownian motion comes from the movement of atoms had been made much before Einstein however, and passed tortuous discussions. Subtle is the Lord by Abraham Pais (1982) page 93 explains it well. There had already been infinite discussion on possible causes of those movements besides atomic theory, and many ideas were rejected as incompatible with observations:
Further investigations eliminated such causes as temperature gradients, mechanical disturbances, capillary actions, irradiation of the liquid (as long as the resulting temperature increase can be neglected), and the presence of convection currents within the liquid.
The first suggestions of atomic theory were from the 1860s.
Tiny uniform plastic beads called "microbeads" are the preferred 2019 modern method of doing this: en.wikipedia.org/wiki/Microbead
Original well known observation in 1827 by Brown, with further experiments and interpretation in 1908 by Jean Baptiste Perrin. Possible precursor observation in 1785 by Jan Ingenhousz, not sure why he wasn't credited better.
Video 1.
Observing Brownian motion of micro beads by Forrest Charnock (2016)
Source.
This is a good concept. For the ammount most people save, having a simple and easy to apply investment thesis is the best way to go.
Video 1.
All the financial advice you’ll ever need fits on a single index card
. Source.
The name makes absolutely no sense in modern terms, as nor colors nor light are used directly in the measurements. It is purely historical.
Pleistocene by Ciro Santilli 40 Updated 2025-07-16
Agriculture is not the official definition of the age. But it is good enough. Likely related to the official end of glaciations thing.
Constructive nonstandard analysis is an approach that combines ideas from nonstandard analysis and constructive mathematics. Nonstandard analysis, developed primarily by Abraham Robinson in the 1960s, introduces a framework for dealing with infinitesimals and infinite numbers using hyperreal numbers, allowing for a rigorous treatment of concepts that extend the classical mathematics.
Parity learning is a concept that typically refers to a type of learning or training strategy in machine learning and artificial intelligence, particularly in the context of learning from imbalanced or challenging datasets. The term can have specific meanings depending on the domain and context. In general, the idea behind parity learning involves ensuring that the model or system can recognize and properly weigh instances of different classes or categories, especially in scenarios where one class may be underrepresented.
Eduardo Héctor Zarantonello is not a widely recognized public figure, so there may not be readily available information regarding him in common databases or sources. He could be a private individual or a local figure known within certain communities or contexts.
Soft tissue refers to a group of tissues in the body that connect, support, or surround other structures and organs. Unlike hard tissues, such as bone, soft tissues are more flexible and can be found throughout the body. Soft tissues include: 1. **Muscle Tissue**: This includes skeletal, cardiac, and smooth muscle, which enable movement and function of various organs.

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