Invariance Principles and Elementary Particles

Books may be placed on reserve for one week. We pack all orders ourselves and, with nearly thirty years in the trade, strive to describe our books as accurately as possible. Refunds may be issued if an item is not as described and is returned in same condition as originally shipped. We accept most major credit cards, checks, money orders, Zelle. We also accept CashApp, Venmo and Paypal. For Paypal, additional nominal fees of approximately 2.5% may apply in order to cover Paypal's 5% commission.