Actually, I get the error:
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-10-6078cc2f8a98> in <module>()
----> 1 det = matrix.determinant(); show(det)
/home/michi/GitProjects/sage/local/lib/python2.7/site-packages/sage/matrix/matrix2.pyx
in sage.matrix.matrix2.Matrix.determinant
(build/cythonized/sage/matrix/matrix2.c:15032)()
1675 if algorithm is None:
1676 try:
-> 1677 R_is_field_attempt = R.is_field()
1678 except NotImplementedError:
1679 R_is_field_attempt = False
/home/michi/GitProjects/sage/local/lib/python2.7/site-packages/sage/structure/category_object.pyx
in sage.structure.category_object.CategoryObject.__getattr__
(build/cythonized/sage/structure/category_object.c:6865)()
832 AttributeError: 'PrimeNumbers_with_category' object has no
attribute 'sadfasdf'
833 """
--> 834 return self.getattr_from_category(name)
835
836 cdef getattr_from_category(self, name):
/home/michi/GitProjects/sage/local/lib/python2.7/site-packages/sage/structure/category_object.pyx
in sage.structure.category_object.CategoryObject.getattr_from_category
(build/cythonized/sage/structure/category_object.c:7028)()
847 cls = self._category.parent_class
848
--> 849 attr = getattr_from_other_class(self, cls, name)
850 self.__cached_methods[name] = attr
851 return attr
/home/michi/GitProjects/sage/local/lib/python2.7/site-packages/sage/cpython/getattr.pyx
in sage.cpython.getattr.getattr_from_other_class
(build/cythonized/sage/cpython/getattr.c:2540)()
387 dummy_error_message.cls = type(self)
388 dummy_error_message.name = name
--> 389 raise AttributeError(dummy_error_message)
390 cdef PyObject* attr = instance_getattr(cls, name)
391 if attr is NULL:
AttributeError: 'MixedFormAlgebra_with_category' object has no attribute
'is_field'
However, the interesting part for me is the commutative subalgebra of even
mixed forms which I could certainly implement. But I am not sure whether
this will work due to the error message above...
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