- #1

- 1

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Hello I hope you can help me in solving this proof

proved A x [B x (Cx D) ] = 0

Thank you

proved A x [B x (Cx D) ] = 0

Thank you

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- Thread starter SAMIA
- Start date

- #1

- 1

- 0

Hello I hope you can help me in solving this proof

proved A x [B x (Cx D) ] = 0

Thank you

proved A x [B x (Cx D) ] = 0

Thank you

- #2

- 9,557

- 767

- #3

Deveno

Science Advisor

- 906

- 6

that's just...cruel.

presumably A,B,C and D lie in R

if so, A must be a linear combination of B,C, and D.

the cross-product is distributive, is it not?

from here it get easy....because of a certain elementary property of cross-products.

- #4

- 9,557

- 767

that's just...cruel.

presumably A,B,C and D lie in R^{3}?

if so, A must be a linear combination of B,C, and D.

the cross-product is distributive, is it not?

from here it get easy....because of a certain elementary property of cross-products.

How does it get easy when it is false? And what is cruel about suggesting that most anything will give a counterexample?

- #5

Deveno

Science Advisor

- 906

- 6

How does it get easy when it is false? And what is cruel about suggesting that most anything will give a counterexample?

except, obviously, for the ones i tried. please excuse me while i shave my facial omelette.

- #6

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