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How to write gradient symbol in Latex ? The gradient of a differentiable function f of several variables is the vector field whose components are the partial derivatives of f
You can use the default math mode with \nabla function:
$$\nabla u$$
$$ \nabla u $$
Let’s write the mathematical definition
$$
\nabla f(\left.x_{1}, x_{2}, \ldots, x_{n}\right)=\left[\begin{array}{c}
\dfrac{\partial f}{\partial x_1}(\left.x_{1}, x_{2}, \ldots, x_{n}\right)\\
\dfrac{\partial f}{\partial x_2}(\left.x_{1}, x_{2}, \ldots, x_{n}\right) \\
\vdots \\
\dfrac{\partial f}{\partial x_n}(\left.x_{1}, x_{2}, \ldots, x_{n}\right)
\end{array}\right]
$$
$$ \nabla f(\left.x_{1}, x_{2}, \ldots, x_{n}\right)=\left[\begin{array}{c} \dfrac{\partial f}{\partial x_1}(\left.x_{1}, x_{2}, \ldots, x_{n}\right)\\ \dfrac{\partial f}{\partial x_2}(\left.x_{1}, x_{2}, \ldots, x_{n}\right) \\ \vdots \\ \dfrac{\partial f}{\partial x_n}(\left.x_{1}, x_{2}, \ldots, x_{n}\right) \end{array}\right] $$
Have a look to gradient conjugate algorithm (english)
Un œil sur la méthode du gradient conjugué (french)