News on deal.II
This page lists news and announcements on
deal.II in reverse chronological order. If you
send us extensions to the library, please feel free to also send a
patch to this file such that we can announce your contributions in
your own words.
Please refer to the archive of the deal.II
mailing list for additional news.
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2010/07/18: Version 6.3.1 released
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Version 6.3.1 was released today. This release addresses a number of
problems in release 6.3.0 related to compatibility with certain
compilers, operating systems, and versions of external libraries.
A list of changes between
versions 6.3.0 and 6.3.1 can be found here.
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2010/06/25: deal.II on Facebook!
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We built a facebook page titled deal.II today. Please, feel free
to join us there!
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2010/06/25: Version 6.3 released
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Version 6.3.0 was released today, containing several new
tutorial programs, a new threading framework and a framework
for assembling linear systems by just providing the local integrals.
A complete list of changes between
versions 6.2.0 and 6.3.0 can be found here.
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2010/06/24: step-39 solves Poisson's equation with
the interior penalty discontinuous Galerkin method on
adaptively refined meshes with multigrid
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Using the MeshWorker framework, this program highlights the
fact that loops over meshes are very generic and that
building matrices and level matrices and evaluating error
estimates are really the same task.
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2010/06/24: The Meshworker framework has been released
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Using its generic loop and the provided auxiliary classes,
this framework relieves the application programmer from coding
loops over cells, faces, and subfaces, such that focus can remain
on implementation of the local integrals.
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2010/06/23: step-45 shows periodic boundary
conditions
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Contributed by Markus Bürg, the new tutorial program step-45
demonstrates an often requested feature: periodic boundary
conditions.
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2010/02/13: New multigrid, new step-16
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Over the last few months, the multigrid implementation has seen
significant rewrites, with much of the work done by Bärbel
Janssen. The goal — now achieved — was to finally fully
support multigrid also for continuous finite elements on adaptively
refined meshes (uniformly refined meshes and discontinuous elements
have worked for a long time). As part of this process, step-16 has
been rewritten and now solves the same problem step-6 solves, just
with a multigrid solver.
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2009/10/07: step-35 shows the solution of the
Navier-Stokes equations
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Step-35, a tutorial program contributed by Abner
Salgado-Gonzalez, shows an implementation of a projection
scheme for the numerical solution of the Navier-Stokes
equations.
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2009/07/30: New tutorial program step-36
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The new step-36 tutorial program, contributed by Toby D. Young and
Wolfgang Bangerth, shows how to solve eigenvalue problems, using the
Schrödinger equation as an example.
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2009/06/05: Version 6.2.1 released
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deal.II version 6.2.0 contained a couple of minor but
annoying bugs in its interaction with PETSc. The
documentation package also did not include any typeset
formulas. Release 6.2.1 corrects these mistakes.
A complete list of changes between
versions 6.2.0 and 6.2.1 can be found here.
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2009/04/27: Version 6.2 released
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Version 6.2.0 was released today!
A complete list of changes between
versions 6.1.0 and 6.2.0 can be found here.
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2009/04/14: New tutorial program step-34
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step-34, written by Luca Heltai, demonstrates the ability of
deal.II to discretize and solve boundary integral equations
on curved manifolds.
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2008/12/05: Support for meshes embedded in
higher dimensions
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Based on work by Cataldo Manigrasso and Luca Heltai
developed over the last few months on a branch, deal.II now
supports meshes that are embedded in higher space
dimensions. This allows, for example, to solve equations on
the surface of a sphere (e.g. to use boundary element
methods for exterior problems).
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2008/11/14: New tutorial program step-31
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The latest tutorial program, step-31, is contributed by
Martin Kronbichler and Wolfgang Bangerth and shows the
solution of the Boussinesq approximation to thermally driven
convection in an incompressible fluid.
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2008/09/10: New tutorial program step-28
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step-28, contributed by Yaqi Wang, illustrates the solution
of a coupled system of diffusion equations relevant to
nuclear reactor physics where we use different meshes for
different components of a vector-valued solution.
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2008/08/21: deal.II now exceeds
of 400,000 lines of code
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Since today, deal.II has more than 400,000
lines of code. The rate of growth continues to be close on
par with the 3000 lines of code per month that we have had
over many years already, with no signs of abating activity!
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2008/07/08: Support for anisotropic mesh refinement
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Contributed by Tobias Leicht as well as Ralf Hartmann, deal.II
now supports anisotropic refinement of meshes. This functionality
is explained in the step-30 tutorial program.
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2008/05/28: Version 6.1 released
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Version 6.1.0 was released today!
A complete list of changes between
versions 6.0.0 and 6.1.0 can be found here.
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2008/05/23: step-33 illustrates the Euler equations
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step-33,
a tutorial program written mostly by David Neckels, illustrates how
the Euler equations of compressible inviscid gas dynamics can be
solved. More generally, the program also provides a framework for
the solution of arbitrary hyperbolic, nonlinear conservation laws.
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2008/03/28: step-22 demonstrates solving the Stokes
equations
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The new step-22
tutorial program, written by Martin Kronbichler and Wolfgang
Bangerth, shows how to solve, and in particular how to solve
efficiently, the Stokes equations that describe viscous
incompressible fluid flow.
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2007/10/31: step-29 tutorial program added
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Contributed by Moritz Allmaras, the step-29 tutorial program
explains how problems involving complex numbers can be treated in
deal.II. In the example,
the complex-valued solution to a Helmholtz equation is split into
real and imaginary parts and a vector-valued finite element field
is used to discretize them seperately. The program also demonstrates
how quantities derived from the finite element solution can be directly
included in the output by using the new
DataPostprocessor
class.
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2007/09/07: Version 6.0 released
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Version 6.0.0 was released today!
A complete and long list of changes between
versions 5.2.0 and 6.0.0 can be found here.
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2007/08/09: step-27 demonstrates hp technology
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The new step-27
tutorial program finally demonstrates how to use the
hp finite element technology that has been part of deal.II for some
18 months now. It solves a Laplace equation with hp finite elements
and shows how to set finite element degrees, assemble matrices on
cells with varying polynomial degrees, and how to compute a simple
criterion for estimating the local Sobolev smoothness of a function.
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2007/07/16: Wilkinson Prize
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The principal authors of deal.II—Wolfgang
Bangerth, Ralf Hartmann and Guido Kanscht—have received the J. H. Wilkinson
Prize for Numerical Software for their creation of and work on
the deal.II library. The prize committee particularly noted the
reliability and usability of the software and the quality of the
documentation.
We want to take the opportunity to thank our user community for their
support over the years that kept us working on this software. We
consider this award motivation to continue this work!
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2007/02/09: Support for previously unorientable meshes
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Up to now, in 3D only 'orientable' meshes could be used in
deal.II, where all lines are in standard orientation and the
faces can be either in standard orientation or with a
reversed normal. This has been generalized such that now all
hexahedral meshes can be used.
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2006/10/30: step-21 is finished
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Step-21 demonstrates the time dependent flow of a multiphase fluid
through a porous medium. It is an extension of step-20, using a mixed
formulation and block solvers.
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2006/10/03: step-23/24/25 are finished
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The step-23, step-24 and step-25 tutorial programs have been added,
demonstrating how to solve the time dependent wave equation
and a nonlinear variant of it, the sine-Gordon equation.
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2006/08/24: deal.II is now part of the
SPEC CPU 2006 benchmark
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A modified version of the deal.II library and the
step-14 tutorial program has been incorporated into the industry
standard SPEC CPU 2006
benchmark testsuite that is used to determine the speed of
computers. It is part of the floating point testsuite CFP2006 as benchmark
447.dealII.
The inclusion of our software into an industry
standard benchmark testsuite will lead to better support of compilers
and machines for the kind of program we write, in particular for
unstructured hierarchical mesh computations. This will in turn
help make our codes run faster on future systems.
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2006/2/12: step-20 is finished
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The new step-20 tutorial program shows how to use Raviart-Thomas
elements to solve a mixed formulation of the Laplace equation. It
also demonstrates the use of block matrices and vectors, and how they
can be used to define more complex solvers and preconditioners
working on the Schur complement.
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2006/1/3-5: First User Workshop
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After 8 years of existence, it was time to have the first user
meeting. During a 3-day workshop held in Heidelberg, topics of
software development, use of deal.II for applications, and future
directions were discussed by about a dozen developers and users.
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2005/12/20: hp functionality merged
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After the code had been developed and maintained on a branch for 3
years by Oliver Kayser-Herold and Wolfgang Bangerth, it has now been
merged into the main development, and will be available for the next
release.
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2005/09/17: Version 5.2 released
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Version 5.2.0 was released today!
A complete and long list of changes between
versions 5.1.0 and 5.2.0 can be found here.
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2005/09/09: Two more tutorial programs
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Two more tutorial programs, step-18 and step-19, are now
available. step-18 shows how to solve time-dependent but quasi-static
elasticity programs in parallel. step-19 demonstrates some data
handling and parameter file techniques.
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2005/03/29: deal.II now has a Wiki
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Hosted by Luca Heltai, there is now a deal.II Wiki. Users of
deal.II are encouraged to visit it, and,
as is usual with wikis, edit pages freely and post their
experiences and code snippets they want others to know about.
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2005/03/07: Function parser library integrated
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Luca Heltai has contributed code that integrates a third
party function
parser library) that takes a string describing a
mathematical function, and returns an object that can be used in
all places where function objects are used in deal.II.
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2004/12/24: Version 5.1 released
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Version 5.1.0 was released today!
A complete and long list of changes between
versions 5.0.0 and 5.1.0 can be found here.
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2004/10/21: Qr elements of arbitrary order now
support hanging node constraints also in 3d
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Lagrange elements previously had hanging node constraint matrices
hard coded in 3d, which were only available for r=1,2. Thanks to
code written by Oliver Kayser-Herold, this information is now
computed on-the-fly, which allows the use of Lagrange elements of
arbitrary order also in 3d on meshes with hanging nodes.
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2004/05/25: Version 5.0 released
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Version 5.0.0 was released today!
A complete and long list of changes between
versions 4.0.0 and 5.0.0 can be found here.
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2004/03/08: Interfaces to PETSc and METIS
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In order to support parallel computations, we now have interfaces to
both the PETSc library for sequential and parallel linear algebra,
as well as to the METIS library for domain partitioning.
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2004/03/08: MIPSpro compiler version 7.41 supported
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deal.II now also supports compilation on SGIs by the MIPSpro
compiler version 7.41.
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2003/06/06: Version 4.0 released
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After one year, we made it and released Version 4.0.0 today!
A complete list of changes between
versions 3.4.0 and 4.0.0 can be found here.
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2003/04/27: deal.II now exceeds
of 200,000 lines of code
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Since today, deal.II has now more than 200,000
lines of code. The rate of growth continues to be close to
3000 lines of code per month.
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2003/01/24: deal.II runs on AIX 5.1
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Using gcc3.2, deal.II can now also be compiled on AIX systems
with the PowerPC chip.
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2002/12/18: deal.II runs on Mac OS X 10.2
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Some changes have been made to allow compiling and running deal.II on
Mac OS X 10.2 systems.
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2002/12/05: Intel ICC 7.0 compiler supported
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deal.II now also supports compilation by the recently released
Intel icc 7.0 compiler.
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2002/06/28: deal.II 64-bit ready
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deal.II also runs on 64-bit systems without changes, as
tests on a Sparc machine with Solaris 9 in 64-bit mode have
shown. We also have reports of people running deal.II on
IA64 systems.
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2002/06/06: Version 3.4 released
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Today, version 3.4 of the deal.II library
has been released. A complete list of changes between
versions 3.3.0 and 3.4.0 can be found here.
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2002/05/22: Intel ECC Itanium compiler now supported
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aclocal.m4
has been changed to detect the Intel ECC
compiler for Itanium systems. The ECC compiler can produce
optimized code for Intel's new IA-64 architecture.
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2002/03/07: New web home www.dealii.org and new
email addresses
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The deal.II homepage has been moved to www.dealii.org. Also the email addresses have been
changed. Though the old web home and the old addresses will
be supported for some time we recommend to adjust the
bookmarks and mail addresses accordingly.
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2002/02/01: Version 3.3 released
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Today, version 3.3 of the deal.II library
has been released. A complete list of changes between
versions 3.2.0 and 3.3.0 can be found here.
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2002/01/31: deal.II now consists
of 160,000 lines of code
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All
.cc
and .h
files of
deal.II now sum up to more than 160,000(!)
lines of code. deal.II continues to grow
with a rate almost constant at 3000 lines of code per month.
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2001/09/28: Version 3.2 released
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After a long phase of implementation and testing, we today
released version 3.2 of the deal.II
library. There are many changes between version 3.1 and
release 3.2. A complete list of these changes can be found
here.
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2001/07/06: Compaq's cxx compiler supported
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The present development version now also supports
compilation by Compaq's cxx compiler. See the ReadMe
file for more information on using this compiler.
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2001/06/28: deal.II 3.1.2 released
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Version 3.1.2 is a bug-fix release based on 3.1. A list of
changes between the two versions can be found on
this
page.
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2001/05/23: Intel ICC compiler supported
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The present development version of the library is now fixed
so that it can also be compiled by
Intel's ICC C++ compiler for Linux.
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2001/05/17: deal.II 3.1.1 released
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Version 3.1.1 is a bug-fix release based on 3.1. A list of
changes between the two versions can be found on
this
page.
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2001/02/26: Support for Subroutines from the Harwell Subroutine
Library (HSL)
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The Harwell Subroutine Library (HSL) is a
library that, among much other functionality, offers some
sparse direct solvers. We have added support for an
interface to these solvers to the library.
(See the ReadMe
file for more information on installation of HSL
subroutines.)
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2001/02/20: Version 3.1 released
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After a long testing phase, we today released version 3.1 of
the deal.II library.
There are many changes between version 3.0 and release
3.1. A complete list of these changes can be found
here.
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2000/08/07: deal.II 3.0.1
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Version 3.0.1 is a bug-fix release based on 3.0. A list of
changes between the two versions can be found on
this
page.
(Announcement)
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2000/04/13: deal.II 3.0 announced
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Today, after 2½ years of development and testing, the
first public release of the deal.II
library was announced (full text).