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norm O
which O
measures O
the O
size O
of O
element O
such O
a O
system O
is O
known O
as O
an O
underdetermined B-Math
system I-Math
if O
in O
addition O
to O
vector B-Math
addition I-Math
and O
scalar O
multiplication O
there O
is O
a O
bilinear O
vector O
product O
v O
v O
v O
the O
vector O
space O
is O
called O
an O
algebra O
for O
instance O
associative O
algebras O
are O
algebras O
with O
an O
associate O
vector O
product O
like O
the O
algebra O
of O
square O
matrices O
or O
the O
algebra O
of O
polynomial O
and O
scalar B-Math
multiplication I-Math
there O
is O
a O
bilinear O
vector O
product O
v O
v O
v O
the O
vector O
space O
is O
called O
an O
algebra O
for O
instance O
associative O
algebras O
are O
algebras O
with O
an O
associate O
vector O
product O
like O
the O
algebra O
of O
square O