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hi .

please help to solve : Vector Dot Problem

if we know that can we infer from that : ?

thanks in advance ...

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- Oct 18th 2010, 11:04 AMparkhidVector Dot Problem
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hi .

please help to solve : Vector Dot Problem

if we know that can we infer from that : ?

thanks in advance ... - Oct 18th 2010, 11:14 AMUnknown008
No, I don't think so...

But

EDIT: I'm not sure of that... yet.

EDIT2: Confirmed! - Oct 18th 2010, 11:15 AMNOX Andrew
No, assuming .

Let , , and . Then, and .

If , then . The preceding equation cannot be solved; therefore, the answer is no.

I found a disproof on Wikipedia: Dot product - Wikipedia, the free encyclopedia - Oct 18th 2010, 11:19 AMUnknown008
Hm... maybe I'm wrong... or is my example an exception?

- Oct 18th 2010, 11:25 AMNOX Andrew
No, you are correct. My reasoning was flawed. Here is a disproof on Wikipedia: Dot product - Wikipedia, the free encyclopedia