Welcome!

Our goal is that more physicists share what they learn. A great possibility to do this is keeping an open online notebook.

Why open online notebooks?

Deepen Your Understand

Writing down thoughts in a non-formal but structured way helps to understand things more clearly.

Help Others

The best way to learn is to read the notes of someone who wrote them down while he learned the topic.

Access Everywhere

When your physics notes are available online you can read and edit them anytime from everywhere.

Examples

Chris Hillman's Notes

"The purpose of these pages is to promote the appreciation and understanding of the special and general theories of relativity"
Urs Schreiber and many others' Notes

"The purpose of the nLab is to provide a public place where people can make notes about stuff. The purpose is not to make polished expositions of material; that is a happy by-product. We all make notes as we read papers, read books and doodle on pads of paper. The nLab is somewhere to put all those notes, and, incidentally, to make them available to others. Others might read them and add or polish them. But even if they don’t, it is still easier to link from them to other notes that you’ve made."
Keith Conrad's Notes

"These were written up for various reasons: course handouts, notes to accompany a talk for a (mathematically) general audience, or for some other purpose that I have since forgotten."
Carl Turner's Notes

"I thought that it might be cool if I collected together some of the things I've come to worry about and/or understand which I think you might like to find out about too."
Solenodonus Notes

"Who is this website made for then? Primarily, for me. I've been feeling like I need a way of organizing my thoughts and technical calculations for a long time by now. Then, for everybody whom it might help in any way. I've posted a collection of special literature on theoretical physics."
Garrett Lisi's Notes

"Welcome to my brain, have fun looking around."
Jakob Schwichtenberg's Notes

"This my attempt to collect those things that help me understand. "
John Baez's Notes

"My introduction to blogging came in 1993 when I started an online column called “This Week’s Finds in Mathematical Physics”. The idea was to write summaries of papers I’d read and explain interesting ideas. I soon discovered that, when I made mistakes, readers would kindly correct them—and when I admitted I didn’t understand things, experts would appear from nowhere and help me out. Other math bloggers report similar results."
Paul Tremper's Notes

"Everything I learn and want to understand better."
A) Do it yourself
Setting up your own online notebook is easy and we have written a detailed how-to guide to help you get started.

Read more ⊵

B) Let us do it for you
Not everyone has webspace and the necessary time available. Thus we are happy to host your physics notes completely free on our server.

Read more ⊵

Why online notebooks?

"My introduction to blogging came in 1993 when I started an online column called “This Week’s Finds in Mathematical Physics”. The idea was to write summaries of papers I’d read and explain interesting ideas. I soon discovered that when I made mistakes, readers would kindly correct them—and when I admitted I didn’t understand things, experts would appear from nowhere and help me out. Other math bloggers report similar results" John C. Baez
Feynman told us a few times to keep notebooks. When working on a hard problem, spend hours of concentrated time. People who don't think for hours without interruption cannot solve hard problems in his opinion. When you stop, try to save your mental state in the notebook. Learn to write notes that allow you to pick up your train of thought. In this way, days of sustained thought could be brought to bear on an extremely hard problem.
“It often happens that two schoolboys can solve difficulties in their work for one another better than the master can. […] The fellow-pupil can help more than the master because he knows less. The difficulty we want him to explain is one he has recently met. The expert met it so long ago he has forgotten. He sees the whole subject, by now, in a different light that he cannot conceive what is really troubling the pupil; he sees a dozen other difficulties which ought to be troubling him but aren’t.”
C. S. Lewis in Reflections on the Psalms
:
"We all waste too much time with searching for mathematical information that is already out there. As a student, before the dawn of the internet, I wasted days in the library, on chasing references to the secrets of the universe. Now the internet exists, but we still waste time searching randomly. Things have not been connected. [...] Sometimes I see people proudly show me their private maths notebooks. Too bad that only one single person is profiting from it. We are an army of wheel-reinventers. (That’s necessary to some extent for personal exercise, but we’ll get nowhere if every single person retraces every single step. That has ended being sensible several hundred years ago.)" From the description of the nLab
Reading Without Writing is Daydreaming! In an online notebook you can share what you learn and organize your thoughts. An online notebook helps you to make sure that you never forget anything again and it's a perfect method to stay organized. Oh... and possibly you help hundreds of others who can read your notes online!