Central Potentials, Radial Equation, Derivation, Quantum Physics.
tensor are determined via a simple rule: Thus, ǫ123 = ǫ231 = 1, ǫ321 = ǫ132 = −1, and ǫ112 = ǫ131 = 0, etc. Equation also makes use of the Einstein summation convention, according to which repeated indices are summed (from 1 to 3). For instance, ai bi ≡ a1 b1 + a2 b2 + a3 b3. Let us calculate the