(a) Prove that for any four vectors we can associate their sum in any way without changing...
Question:
(a) Prove that for any four vectors 
we can associate their sum in any way without changing the result.
This allows us to write 
without ambiguity.
(b) Prove that any two ways of associating a sum of any number of vectors give the same sum. (Use induction on the number of vectors.)
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a A small rearrangement does the trick Each equality above follows from the associativity of three v...View the full answer
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