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Hi all,

Consider http://doc.sagemath.org/html/en/reference/manifolds/sage/manifolds/differentiable/affine_connection.html The very last command of this web page is

sage: for i in M.irange():
        nab.torsion_form(i, e) == ef[i].exterior_derivative() + \
        sum(nab.connection_form(i,j,e).wedge(ef[j]) for j in M.irange())

The output of this command should be: True, True, True, but I get no output at all. In order to duplicate you should include also the previous commands beginning from the torsion_form definition, over all 3 cells.

Daniel

Hi all,

Consider http://doc.sagemath.org/html/en/reference/manifolds/sage/manifolds/differentiable/affine_connection.html The very last command of this web page is

sage: for i in M.irange():
        nab.torsion_form(i, e) == ef[i].exterior_derivative() + \
        sum(nab.connection_form(i,j,e).wedge(ef[j]) for j in M.irange())

The output of this command should be: True, True, True, but I get no output at all. In order to duplicate you should include also the previous commands beginning from the torsion_form definition, over all 3 cells.

Daniel