When You're a KET !

Paul Dirac, a famous quantum physicist, introduced in 1930 a unique notation called a 'KET' to represent the state of a quantum system . To define a scalar product, there is another notation, called a 'BRA', so that we can define a scalar product 'BRA-KET', which gives a number. This notation greatly simplified the mathematical development of Quantum Mechanics.

What happens WHEN YOU'RE A KET? Please sing the song When You're a Ket by Prof. Paul Halpern in the following link:

http://www.haverford.edu/physics/songs/Halpern/ket_music.htm