# Math Help - Suffix Notation Operators

1. ## Suffix Notation Operators

A very quick question here, going over my lectures notes and I've missed out an example on suffix notation, I've got

1) $(\nabla \phi)_i = \frac{\partial \phi}{\partial x_i}$
...
7) $\left[ (\upsilon \cdot \nabla) u \right]_i =$

I included the first one as an example of the new notation they were giving us examples of, and 7) is the one I've got missing, would be grateful if someone could help me out.