Prove that if
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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What is ?
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.
Here is one way to rewrite the notation to avoid confusion. .
Now the definition is a bit easier to understand.
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