| 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 |