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Evaluate scalar triple products

  • Thread starter DryRun
  • Start date
  • #1
DryRun
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http://s2.ipicture.ru/uploads/20111115/BiYq94IS.jpg

Here is the determinant for axb:
w x y z
1 -2 3 -4
-1 2 4 -5

Then, how to proceed?? Can someone please help?
 
Last edited:

Answers and Replies

  • #3
DryRun
Gold Member
838
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My confusion is how to get a 3x3 determinant when the vectors a, b and c are presented as being in R^4.
For example, when i make the determinant for c.(axb), i get:

c1 c2 c3 c4
a1 a2 a3 a4
b1 b2 b3 b4

But it's not possible to evaluate such a 3x4 determinant, right? And the question is requesting that i evaluate a 3x3 determinant.

Any ideas?
 
Last edited:
  • #4
HallsofIvy
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I guess the question is "How is the triple product of two vectors defined in R4"?
 
  • #5
DryRun
Gold Member
838
4
I honestly have no idea, but this is really the entire question:
http://s2.ipicture.ru/uploads/20111115/BiYq94IS.jpg
 

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