Commenting on or reporting errors in posts

This blog is used by me mainly to report new posts on physicspages.com, (you can sign up to new posts by entering your email in the box on the right) but you can also submit comments and error reports here. To make a comment or error report:

  1. Copy the title and/or the URL of the post you wish to comment on.
  2. Click on the <number> comments link at the end of this post (<number> is the current number of comments and will vary).
  3. If the <number> comments link isn’t visible, scroll to the bottom of the page until you find a ‘Leave a reply’ box.
  4. Scroll to the end of the comments and add your comment there.
  5. If you’re commenting on a particular equation in a post, please make sure you include the equation number in your comment.

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Permutation groups – cycles and transpositions

Permutation groups – cycles and transpositions

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Direct products of groups

Direct products of groups

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Group multiplication tables and order-6 groups

Group multiplication tables and order-6 groups

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Subgroups and Lagrange’s theorem

Subgroups and Lagrange’s theorem

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Definition of a group

Definition of a group

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Quantum field theory resources

Here are a couple of resources for quantum field theory that I’ve recently encountered.

  • A set of video lectures on QFT by Hitoshi Murayama is available as a 2022 YouTube playlist. The videos are pitched at an (advanced) undergraduate level, so should be accessible if you have a background in special relativity and non-relativistic quantum mechanics.
  • Miscellaneous Topics in Quantum Field Theory, With Applications to Particle Physics, Stany M. Schrans (2021). Available as a free PDF here. This is not a published book, but is rather the author’s notes that he made while working through standard textbooks. It would certainly qualify as a textbook, however, as it is truly massive (1761 pages!). Its main advantage is that it fills in many of the derivations that most textbooks skip over. I haven’t delved too far into it, but it seems to be written at an advanced undergraduate level.
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Lorentz invariance of electric charge

Lorentz invariance of electric charge

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Cusps in the evolution of closed strings

Cusps in the evolution of closed strings

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Planar motion and the formation of cusps

Planar motion and the formation of cusps

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Planar motion for an open string with fixed endpoints

Planar motion for an open string with fixed endpoints

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