Dear all, This is to announce the availability of two preprints. 1) "Group valued differential forms revisited" We study the relationship between combinatorial group valued differential forms and classical differential forms with values in the corresponding Lie algebra. In particular, we compare simplicial coboundary and exterior derivative. The results represent strengthening of results I obtained in 1982. This preprint can be downloaded from http://www.imf.au.dk/publs?id=636 or from my home page http://home.imf.au.dk/kock/ 2) "Some matrices with nilpotent entries, and their determinants" We study algebraic properties of matrices whose rows are mutual neighbours, and are also neigbours of 0 (neighbour in the sense of a certain nilpotency condition). The intended application is in synthetic differential geometry. For a square matrix of this kind, the product of the diagonal entries equals the determinant, modulo a factor n! This preprint can be downloaded from http://arxiv.org/abs/math.RA/0612435 or from my home page (address as above). Yours Anders