4-gradient

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[math]\nabla_i=\frac{\partial}{\partial r_i}=\partial_i[/math]


[math]\mathbf \partial_\mu \equiv[\frac{\partial}{\partial t}\ \frac{\partial}{\partial x}\ \frac{\partial}{\partial y}\ \frac{\partial}{\partial z}]=[\frac{\partial}{\partial x}\ \frac{\partial}{\partial x}\ \frac{\partial}{\partial x}\ \frac{\partial}{\partial x}][/math]