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Question: Calculating christoffel symbol with differential geometry package

with(DifferentialGeometry): with(Tensor):

DGsetup([x1, x2, x3, x4], M)

g1 := evalDG(dx1dx3+dx2dx4-u22(dx3)^2-u11(dx4)^2+2*u12*dx3dx4)

C1 := Christoffel(g1)

 

^^^ This is my code, I know theres something wrong with the metric but I'm not sure what, any help would be appreciated thanks! (This code gives me no answer).

u11*u22-u12^2+u13+u24 = 0   - This is the original eq I was working off.

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