λa+b+vc =0 constants not all zero c.(axb)=0


by indie452
Tags: λa, caxb0, constants
indie452
indie452 is offline
#1
May13-09, 04:11 PM
P: 124
1. The problem statement, all variables and given/known data

past paper qu...

λa + b + vc = 0
for some λ, , v not all zero show c.(axb)=0

consider cases v not equal to 0 and v = 0

3. The attempt at a solution

not sure how to start so if someone could just point me in the right direction or offer another hint it may help me get started in the mean time i'll keep looking at it

thanks


ok i think i made a bit of progress:-

when v not= 0
λa.(axb) + b.(axb) + vc.(axb) = 0.(axb)

so vc.(axb) = 0
=> c.(axb) = 0
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Dick
Dick is offline
#2
May13-09, 04:25 PM
Sci Advisor
HW Helper
Thanks
P: 25,176
Use properties of the dot and cross product. axb is perpendicular to both a and b, right?
So a.(axb)=b.(axb)=0. And if a and b are parallel, then axb=0.
indie452
indie452 is offline
#3
May13-09, 04:30 PM
P: 124
Quote Quote by Dick View Post
Use properties of the dot and cross product. axb is perpendicular to both a and b, right?
So a.(axb)=b.(axb)=0. And if a and b are parallel, then axb=0.
ok this along with the progress i made earlier has helped me do the qu

thanks alot


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