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
Qubit, An Intuition #2 — Inner Product, Outer Product, and Tensor Product in Bra-ket Notation | by Andi Sama | Medium
Schwarz inequality with bra-ket notation
Answered: Orthogonality and inner products.… | bartleby
math input panel - How to enter bra-ket notation in MS OneNote? - Super User