31. The covariant derivative \ nabla _ a is defined to annihilate the tetrad E _ a ^ I. 32. Also listing the band's albums .-Nabla 16 : 49, 15 June 2007 ( UTC) 33. Where \ nabla denotes the gradient and \ cdot denotes the dot product in the two-dimensional plane. 34. With \ boldsymbol { \ nabla } the gradient operator and \ partial _ t the time derivative operator. 35. The nabla symbol is available in standard HTML as & nabla; and in LaTeX as \ nabla. 36. The nabla symbol is available in standard HTML as & nabla ; and in LaTeX as \ nabla. 37. The nabla symbol is available in standard HTML as & nabla; and in LaTeX as \ nabla . 38. One alternative notation for the covariant derivative of any tensor is the subscripted nabla symbol \ nabla _ \ beta. 39. One alternative notation for the covariant derivative of any tensor is the subscripted nabla symbol \ nabla _ \ beta. 40. Also, the Cauchy Riemann equations imply that the dot product \ nabla u \ cdot \ nabla v = 0.
