The Tutte theorem, also known as the Tutte-Berge formula, is a fundamental result in graph theory concerning perfect matchings in bipartite and general graphs. The theorem provides necessary and sufficient conditions for the existence of a perfect matching in a graph.
J.W. Niemantsverdriet is a notable figure in the field of chemistry and materials science, particularly known for his work in catalysis and surface science. He has contributed significantly to the understanding of chemical reactions on surfaces, particularly in the context of heterogeneous catalysis. His research often involves the application of spectroscopic techniques to study reactions at the molecular level. In addition to his research contributions, Niemantsverdriet has been involved in educating and mentoring students in the field of chemistry.
Lebanese physicists are individuals from Lebanon who specialize in the field of physics, contributing to various areas of research and academia. Lebanon has a number of universities and research institutions where physicists study, teach, and conduct research. Lebanese physicists have made contributions in various subfields, including theoretical physics, experimental physics, astrophysics, condensed matter physics, and nuclear physics.
"Palestinian physicists" refers to individuals from Palestine who specialize in the field of physics. They may work in various subfields such as theoretical physics, experimental physics, condensed matter physics, astrophysics, or particle physics, among others. The community of Palestinian physicists may include those working in universities, research institutions, and other scientific organizations, both within the Palestinian territories and abroad.
The term "Sudanese physicists" typically refers to individuals from Sudan who work or specialize in the field of physics. Sudan has a history of contributing to various fields of science, including physics, through its universities and research institutions. Sudanese physicists may engage in a wide range of areas within physics, such as theoretical physics, experimental physics, astrophysics, and applied physics, among others.
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 2. You can publish local OurBigBook lightweight markup files to either OurBigBook.com or as a static website.
Figure 3. Visual Studio Code extension installation.
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. 
- 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