<s>
In	O
applied	O
mathematics	O
,	O
Raviart	B-Algorithm
–	I-Algorithm
Thomas	I-Algorithm
basis	I-Algorithm
functions	I-Algorithm
are	O
vector	O
basis	O
functions	O
used	O
in	O
finite	B-Application
element	I-Application
and	O
boundary	B-Algorithm
element	I-Algorithm
methods	I-Algorithm
.	O
</s>
<s>
The	O
space	B-Algorithm
spanned	O
by	O
the	O
Raviart	B-Algorithm
–	I-Algorithm
Thomas	I-Algorithm
basis	I-Algorithm
functions	I-Algorithm
of	O
order	O
is	O
the	O
smallest	O
polynomial	O
space	B-Algorithm
such	O
that	O
the	O
divergence	B-Application
maps	O
onto	O
,	O
the	O
space	B-Algorithm
of	O
piecewise	O
polynomials	O
of	O
order	O
.	O
</s>
<s>
In	O
two-dimensional	O
space	B-Algorithm
,	O
the	O
lowest	O
order	O
Raviart	O
Thomas	O
space	B-Algorithm
,	O
,	O
has	O
degrees	O
of	O
freedom	O
on	O
the	O
edges	O
of	O
the	O
elements	O
of	O
the	O
finite	B-Application
element	I-Application
mesh	O
.	O
</s>
