<s>
deal.II	B-Language
is	O
a	O
free	O
,	O
open-source	B-Application
library	O
to	O
solve	O
partial	O
differential	O
equations	O
using	O
the	O
finite	B-Application
element	I-Application
method	I-Application
.	O
</s>
<s>
It	O
is	O
one	O
of	O
the	O
most	O
widely	O
used	O
finite	B-Application
element	I-Application
libraries	O
,	O
and	O
provides	O
comprehensive	O
support	O
for	O
all	O
aspects	O
of	O
the	O
solution	O
of	O
partial	O
differential	O
equations	O
.	O
</s>
<s>
The	O
founding	O
authors	O
of	O
the	O
project	O
Wolfgang	O
Bangerth	O
,	O
Ralf	O
Hartmann	O
,	O
and	O
Guido	O
Kanschat	O
won	O
the	O
2007	O
J	O
.	O
H	O
.	O
Wilkinson	O
Prize	O
for	O
Numerical	O
Software	O
for	O
deal.II	B-Language
.	O
</s>
<s>
dimension	O
independent	O
programming	O
using	O
C++	B-Application
templates	I-Application
on	O
locally	B-Algorithm
adapted	I-Algorithm
meshes	I-Algorithm
,	O
</s>
<s>
a	O
large	O
collection	O
of	O
different	O
finite	B-Application
elements	I-Application
of	O
any	O
order	O
:	O
continuous	O
and	O
discontinuous	O
Lagrange	O
elements	O
,	O
Nedelec	O
elements	O
,	O
Raviart-Thomas	O
elements	O
,	O
and	O
combinations	O
,	O
</s>
<s>
parallelization	O
using	O
multithreading	O
through	O
TBB	B-Application
and	O
massively	O
parallel	O
using	O
MPI	B-Application
.	O
</s>
<s>
deal.II	B-Language
has	O
been	O
shown	O
to	O
scale	O
to	O
at	O
least	O
16,000	O
processors	O
and	O
has	O
been	O
used	O
in	O
applications	O
on	O
up	O
to	O
300,000	O
processor	O
cores	O
.	O
</s>
<s>
interfaces	O
to	O
several	O
libraries	O
including	O
Gmsh	B-Language
,	O
PETSc	B-Language
,	O
Trilinos	B-Language
,	O
METIS	B-Algorithm
,	O
VTK	B-Language
,	O
p4est	O
,	O
BLAS	B-Application
,	O
LAPACK	B-Application
,	O
HDF5	B-Application
,	O
NetCDF	B-Application
,	O
and	O
Open	B-Language
Cascade	I-Language
Technology	I-Language
.	O
</s>
<s>
Since	O
then	O
deal.II	B-Language
has	O
gotten	O
contributions	O
from	O
several	O
hundred	O
authors	O
and	O
has	O
been	O
used	O
in	O
more	O
than	O
2,000	O
research	O
publications	O
.	O
</s>
<s>
It	O
is	O
developed	O
as	O
a	O
worldwide	O
community	O
of	O
contributors	O
through	O
GitHub	B-Application
that	O
incorporates	O
several	O
hundred	O
changes	O
by	O
dozens	O
of	O
authors	O
every	O
month	O
.	O
</s>
