| 11. | :: As noted below by Nabla there is sufficent coverage elsewhere.
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| 12. | Where \ nabla \ mathcal { F } is called the shape gradient.
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| 13. | Where \ nabla ^ 4 is the biharmonic operator.
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| 14. | Where & nabla; is the del operator.
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| 15. | Compare this to \ nabla d = e.
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| 16. | Where \ hbar is reduced Planck constant and \ nabla ^ 2 is the Laplacian.
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| 17. | This could be verified by examining the second derivative \ nabla _ { ww }.
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| 18. | So that \ nabla _ X Y depends only on the metric and is unique.
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| 19. | Vector field \ mathbf { p } = \ nabla S is conservative vector field.
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| 20. | With the laplacian \ textstyle \ nabla ^ 2 taken in respect to actual space.
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