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Same scheme can be applied to functions instead of numbers.
- Consider a function

- Function
is transformed to the series of its Fourier coefficients
by the Fourier transform:
The sequence
is bounded by the inequality
 |
(1) |
for any function
.
- We may complement
of the type (1) to the set of all
sequences, with may have unconstrained sum of the squares of their elements.
- Applying then the inverse Fourier transform we define the expansion of the
functional space
to the space of distributions
.
Andre Cherkaev
2001-11-16