Hi, We have just released version 0.4 of SageManifolds<http://sagemanifolds.obspm.fr/> There are almost no new functionalities with respect to version 0.3, but the internal code has been seriously amended. Following discussions on this list and with Sage experts in Paris, the coordinate charts and the vector frames have been made hashable and are now used as keys in various internal dictionaries (like the dictionary of sets of components of a given tensor field with respect to various vector frames). Besides, Sage's Parent/Element scheme has been implemented for Domain/Point, with Domain in the category of Sets. More in the changelog <http://sagemanifolds.obspm.fr/changelog.html> See also example worksheets <http://sagemanifolds.obspm.fr/examples.html>based of version 0.4 and the main documentation <http://sagemanifolds.obspm.fr/documentation.html> (including the reference manual<http://sagemanifolds.obspm.fr/doc/sagemanifolds/index.html> ).
The sources of version 0.4 are available in a branch of trac.sagemath.org (see ticket #14865 <http://trac.sagemath.org/ticket/14865>). The development version is at https://github.com/sagemanifolds/ and can be installed according to these instructions<http://sagemanifolds.obspm.fr/install_from_git.txt> . In view of a better integration into Sage, the tensor algebra part of SageManifolds is currently refactored, in a branch devoted to tensor products of generic free modules. By *generic* it is meant without any privileged basis; this applies to tangent spaces at points of the manifold, but also to tensor fields on parallelizable subdomains, which form a free module over the ring of differentiable scalar fields. This "tensor on free modules" part should be included in version 0.5. Since it is completely independent of the rest of SageManifolds, it could constitute a first integration of a well defined subpart of SageManifolds into Sage. Further work on this should take place during Sage Day 57 in Cernay. As usual, comments and suggestions are most welcome. <http://sagemanifolds.obspm.fr/changelog.html> -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/groups/opt_out.
