Hi, Le mercredi 21 septembre 2016 17:09:09 UTC+2, HG a écrit : > > > > AttributeError: 'DiffFormFreeModule_with_category.element_class' object has > no attribute 'exterior_der' > > As mentionned in http://sagemanifolds.obspm.fr/changelog.html the function exterior_der has been renamed exterior_derivative; so please change each occurence of exterior_der to exterior_derivative and everything should be fine. Sorry for the inconvenience.
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