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(Mathematics) maths the differential operator i(∂/∂x) + j(∂/∂y) + k(∂/∂z), where i, j, and k are unit vectors in the x, y, and z directions. Symbol: Also called: nabla
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014



n. Math.
a differential operator. Symbol:
[1900–05; short form of delta]




1. delegate; delegation.
2. delete.
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References in periodicals archive ?
Eloe, Discrete fractional calculus with the nabla operator, Electron.
where [e.sub.k] and [h.sub.k] are the elementary and the homogeneous symmetric functions of degree k respectively, [nabla] is the well known nabla operator introduced by Bergeron and Garsia (see [2, Section 9.6]), and the scalar product is the usual Hall inner product on symmetric functions.
where [[nabla].sub.t] stands for the tangential components of the nabla operator.