Shipped from UK, please allow 10 to 21 business days for arrival. Fair, xiii, 201 p., illus. Good condition, wolfgang has written a message to previous owner on front endpaper, in April 1971. Dust jacket has a small 1cm tear front top, otherwise very good.
Yet another top quality little book on Physics from Dover.
Want to see how the variational principles and the principle of least action appears in most important physical theories (quantum mechanics, hamiltonian mechanics, fluid mechanics...) ?
Probably a great, concise discussion of variational principles and their history. Mandelstam and Yourgrau start with Hero's analysis of light, and then jump to Fermat.
One of the great positives this book has: it contains multiple "sanity checks", deriving the same result from a different starting point.
It's a little weak on discussing gauge symmetries, but one could easily consult Henneaux and Teitelboim's Quantization of Gauge Systems for sordid details of that...