In Sage 10.4, Ext=ExteriorAlgebra(QQ,['p']) Ext.inject_variables() Mp = matrix(1,1,[[p]]) Mp[0,0]*Mp[0,0] -> 0 Mp*Mp FAILS! (This did work in an older version.) --------------------------------------------------------------------------- TypeError Traceback (most recent call last) Cell In[10], line 1 ----> 1 Mp* Mp File /data/Software/Sage/sage/src/sage/structure/element.pyx:4116, in sage.structure.element.Matrix.__mul__() 4114 # better be square for the product to be defined. 4115 if (<Matrix>left)._nrows == (<Matrix>left)._ncols: -> 4116 return (<Matrix>left)._matrix_times_matrix_(<Matrix>right) 4117 else: 4118 parent = (<Matrix>left)._parent File /data/Software/Sage/sage/src/sage/matrix/matrix0.pyx:5675, in sage.matrix.matrix0.Matrix._matrix_times_matrix_() 5673 return self._multiply_strassen(right) 5674 else: -> 5675 return self._multiply_classical(right) 5676 5677 cdef bint _will_use_strassen(self, Matrix right) except -2: File /data/Software/Sage/sage/src/sage/matrix/matrix_generic_dense.pyx:323, in sage.matrix.matrix_generic_dense.Matrix_generic_dense._multiply_classical() 321 m = i*snc 322 for k in range(snc): --> 323 z += left._entries[m+k]._mul_(right._entries[k*nc+j]) 324 v[p] = z 325 p += 1 TypeError: 'NotImplementedType' object is not callable
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