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One or more new changesets pushed to the primary ufl repository.
A short summary of the last three changesets is included below.

changeset:   307:859e6ffb26cc9a8ada230ca410a21c0baf55289b
tag:         tip
user:        "Martin Sandve Alnæs <martinal@xxxxxxxxx>"
date:        Fri Oct 03 12:19:50 2008 +0200
files:       ufl/algorithms/ad.py ufl/algorithms/checks.py ufl/algorithms/predicates.py ufl/form.py ufl/integral.py
description:
Disabled assertion on is_multilinear in validate_form: it isn't correct in general.
Some fixes in differentiation functions.
Added negation of forms and integrals, so I can do:

f = ...*dx + ...*ds
F = derivative(f, u)
J = derivative(-F, u)

and assemble the Newton system directly from F,J.


changeset:   306:5f7a6f9c64c09f63962582d8eabdf7d3cc6d3d8a
user:        "Martin Sandve Alnæs <martinal@xxxxxxxxx>"
date:        Fri Oct 03 09:40:43 2008 +0200
files:       demo/H1norm.ufl demo/L2norm.ufl demo/convection_jacobi.ufl demo/convection_jacobi2.ufl demo/convection_vector.ufl demo/explicit_convection.ufl demo/hyperelasticity1D.ufl demo/mass.ufl demo/mixed_elasticity.ufl demo/mixed_poisson.ufl demo/pow_ad.ufl demo/source.ufl demo/stiffness.ufl ufl/algorithms/ad.py
description:
Added 1D hyperelasticity demo, useful for testing AD.

Added author and last changed date to demos.


changeset:   305:46e68a421ce86d2b3e7486ba36c05aa080c5bc5b
user:        "Martin Sandve Alnæs <martinal@xxxxxxxxx>"
date:        Thu Oct 02 18:45:53 2008 +0200
files:       demo/mixed_elasticity.ufl demo/mixed_poisson.ufl test/analyse-demos.py ufl/algorithms/ad.py ufl/split.py ufl/variable.py
description:
Added mixed examples from Marie, fixed two minor bugs,
some tests fail on these examples.

Marie wants to have skew symmetry for TensorElement,
which doesn't fit into the current symmetry argument.

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