Homework Help: Vector question

1. Mar 10, 2009

superwolf

What is meant by this sentence:

"In a cubic system, all directions of the vectors [100], [010], [001], $$[bar{1} 00]$$, $$[0 bar{1} 0]$$, and $$[00 bar{1}]$$, areequivalent and indistinguishable."

They point in different directions!

2. Mar 10, 2009

CompuChip

I assume they are talking about a crystal here. Then the statement just says that you cannot tell along which of the given vectors you are looking by examining the crystal.

3. Mar 11, 2009

superwolf

Is plane (1 1 2) identical to (-1 -1 -2), or are they just parallel?