  The topic of this letter is structure formation with topological defects. We
first present a partially new, fully local and gauge invariant system of
perturbation equations to treat microwave background and dark matter
fluctuations induced by topological defects (or any other type of seeds). We
show that this treatment is extremly well suited for linear numerical analysis
of structure formation by applying it to the texture scenario. Our numerical
results cover a larger dynamical range than previous investigations and are
complementary since we use substantially different methods.
