Suppose you had the expressions $u_{j} \frac{\partial u_{i}}{\partial x_{j}}$ and $u_{j} \frac{\partial u_{j}}{\partial x_{i}}$.
Explaining the rules/method used, how would you express these in vector form?
2026-04-26 08:41:16.1777192876
What rules of index notation would be used to write these expressions in vector form?
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