| 21. | This is a gradient \ nabla ^ a t is everywhere timelike and future-directed.
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| 22. | Where \ nabla _ \ mu is the general-relativistic covariant derivative of a spinor.
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| 23. | Further \ rho is the fluid density and \ nabla \ times is the curl operator.
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| 24. | Implying that the vector \ nabla \ psi is normal to the curve \ psi = C.
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| 25. | Where the \ nabla on the right denotes the gradient and \ cdot is the dot product.
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| 26. | If all the elements of \ nabla f are desired, then n function evaluations are required.
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| 27. | An arbitration request regarding User : Nabla has now closed and the decision can be read here.
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| 28. | This tells us that \ nabla coincides with D when acting on objects with only internal indices.
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| 29. | In other words, the unary " modal " operations \ nabla _ j are lattice endomorphisms.
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| 30. | The symbol \ partial _ k denotes partial derivative, while \ nabla _ k denotes covariant derivative.
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