Twitter 上的 MathType:"The bra-ket notation devised by Paul Dirac is used in #QuantumPhysics as a way to make linear algebra operations more expressive. Of course, it is nothing but a rewriting of
quantum mechanics - Expectation Value in Bra-ket notation - Physics Stack Exchange
File:Bra ket inner product.svg - Wikimedia Commons
Expectation Values
579.Notation
Bra–ket notation - Wikipedia
2: The state of Schrödinger's cat expressed in bra-ket notation. | Download Scientific Diagram
Dirac Bra-ket Notation
Dirac notation - YouTube
How to denote Bra-ket notation in LaTeX? Dirac notation