**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: 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**
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