<s>
If	O
H	O
is	O
a	O
finite-dimensional	O
space	O
,	O
then	O
every	O
basis	O
of	O
H	O
is	O
a	O
Riesz	B-Algorithm
basis	I-Algorithm
.	O
</s>
<s>
and	O
let	O
denote	O
the	O
Fourier	B-Algorithm
transform	I-Algorithm
of	O
.	O
</s>
<s>
The	O
first	O
of	O
the	O
above	O
conditions	O
is	O
the	O
definition	O
for	O
(	O
)	O
to	O
form	O
a	O
Riesz	B-Algorithm
basis	I-Algorithm
for	O
the	O
space	O
it	O
spans	O
.	O
</s>
