Erratum in book published January 10, 2023

  Please tell people who bought the book. Post it on twitter, instagram, tik tok, etc. :-)

   
page 136, line 6: Z3 -> X3
page 179, line 12: the trajectory with shortest proper time -> the trajectory with smallest action
page 179, line 18: to minimize the proper time -> to minimize the action
page 191, second paragraph from bottom, formula for the Lagrangian. Inside the square root, it should be simply d tau2. See image
page 267, line 14: and time and proper time are almost the same -> and coordinate time and proper time are almost the same

  If you find other typos or mistakes, please contact André Cabannes: andre.cabannes@gmail.com