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Life & fun · September 5, 2021

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Relativity: A Modern Primer

A short and sweet textbook on Einstein’s theory of relativity

Relativity: A Modern Primer launched on September 5, 2021 with 204 votes, #125 of 2,941 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 5 years on.

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In plain words

Relativity: A Modern Primer is an educational resource exploring Einstein's theory of relativity for general audiences. Designed for people interested in physics and cosmology without requiring advanced mathematical background, it breaks down complex concepts into accessible explanations. The primer covers both special and general relativity, helping readers understand how space, time, and gravity fundamentally work. It's suitable for students, curious learners, and anyone seeking to grasp one of physics' most important theories.

written from the facts on this page · September 2026

From the sources

A short and sweet textbook on Einstein’s theory of relativity, and more. Learning relativity was a long journey for me. From college courses to self-study, I needed many resources to fully understand the theory, and I eventually felt that I could explain it better and with fewer words than other textbooks. Here is the result. Vector calculus and classical mechanics. Basically, a standard freshman or sophomore physics curriculum in the US. Some knowledge of linear algebra and electromagnetism will also help, although Appendix A develops the necessary linear algebra. I will write an exercise solutions manual if there is enough interest. Contact me at [email protected] . Also check out my…from ramp-book.com

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