Applications of a Simple Formula
Abstract
Description
New applications of the formula $A |ψ\rangle = \langle A \rangle |ψ\rangle + ΔA |ψ_{\perp} \rangle$ are discussed. Simple derivations of the Heisenberg uncertainty principle and of related inequalities are presented. In addition, the formula is used in an instructive paradox which clarifies a fundamental notion in quantum mechanics.
Latex, 7 pages
Latex, 7 pages