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## Homework Statement

Ok so I'm meant to answer:

To what scalar or vector quantities do the following expressions in suffix notation correspond? (expand and sum where possible).

1) a

_{i}b

_{j}c

_{i}

2) a

_{i}b

_{j}c

_{j}d

_{i}

3) d

_{ij}a

_{i}a

_{j}

4) d

_{ij}d

_{ij}

5) e

_{ijk}a

_{i}b

_{k}

6)e

_{ijk}d

_{ij}

## Homework Equations

## The Attempt at a Solution

Okay so I'm pretty stuck to say the least..any help would be great..Here are some thoughts:

1)doesnt this just mean we sum that components of a and c and b can take any value? I'm confused..does this mean the result is a vector.?

2)so we sum a and d and b and c..but how do i simplify this?

3)ok so this one i think i know....isn't it just a

_{j}a

_{j}so sum the components of a? a.a?

4)doesnt this just equal d

_{ij}?

5) Not sure

6) Again,not sure :(

thanks