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Homework Help: Vector question

  1. Mar 10, 2009 #1
    What is meant by this sentence:

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

    They point in different directions!
     
  2. jcsd
  3. Mar 10, 2009 #2

    CompuChip

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    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.
     
  4. Mar 11, 2009 #3
    Is plane (1 1 2) identical to (-1 -1 -2), or are they just parallel?
     
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