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The Definition of
The Definition of Scalar Products and Orthonormality
is a number (scalar) written by physicists
where
is called a Bra.
The Bra-ket is
or scalar product
Therefore,
The components of
A
with respect to basis
The basis
is orthonormal
unless
l=k
when
is Kronecker delta
Geoffrey Fox
,
Northeast Parallel Architectures Center
at Syracuse University,
gcf@npac.syr.edu
is a number (scalar)
written by physicists 
where
is called a Bra.
or scalar product
is orthonormal
unless l=k when 
is
Kronecker delta