Prove that if

1.

2.

3.

Here are the first three steps of the solution i have in the book, i know how to go after step three, here is what i can't figure out:

What is done in step 1 that leads to step 2?

Why is ?

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- January 31st 2008, 07:40 AMPinskyDivergence
Prove that if

1.

2.

3.

Here are the first three steps of the solution i have in the book, i know how to go after step three, here is what i can't figure out:

What is done in step 1 that leads to step 2?

Why is ? - January 31st 2008, 07:57 AMThePerfectHacker
What is ?

- January 31st 2008, 08:15 AMPinsky
it's a radivector. Wasn't able to find a right translation of the word. If you don't understand what it is i'll try to explain.

- January 31st 2008, 08:32 AMPlato
Here is one way to rewrite the notation to avoid confusion.

.

Now the definition is a bit easier to understand.

Clearly .