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20230624 21:44:50 +0200  marked best answer  Keep metric purely symbolic Is there an easy way to define a purely symbolic riemannian metric on a manifold?
Or do I need to initialize it like this

20230624 21:44:40 +0200  marked best answer  Why does sage fail to detect the symmetry here? I want to define a (degenerate) metric: this fails because Sage does not believe the tensor field to be symmetric. 
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20230624 16:07:25 +0200  commented answer  Why does sage fail to detect the symmetry here? Thanks, this works of course. Just find it odd that g.set(...) does not explicitly check that the argument is symmetric. 
20230624 00:56:41 +0200  asked a question  Why does sage fail to detect the symmetry here? Why does sage fail to detect the symmetry here? M = Manifold(4, 'M') CM.<u,r,θ,φ> = M.chart(r'u r:(0,+oo) θ:(0,pi) 
20230623 15:52:37 +0200  commented answer  Keep metric purely symbolic oh, that is a pity. both in terms of writing it out and computationally. I will then use cadabra2 in the meantime for th 
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20230623 14:03:08 +0200  asked a question  Keep metric purely symbolic Keep metric purely symbolic Is there an easy way to define a purely symbolic riemannian metric on a manifold? Or do I ne 
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20220815 12:27:50 +0200  asked a question  Sage Manifolds: Asymptotically de Sitter Spacetime in FeffermanGraham Gauge Sage Manifolds: Asymptotically de Sitter Spacetime in FeffermanGraham Gauge I am new to the Sage Manifolds package and 