How is this proof valid? ax(bxc) = (c.a)b-(b.a)c

  1. Hello everyone, i'm looking at this proof and its making sence until the very last part, and it doens't friggin' work...the terms don't match up... Also is the notation I used correct in the proof, like does there have to be any vector notation I don't have or do you see anyhting you don't like? I'm proving the "The Vector triple product"
    Here is my proof:
    Look at the 2nd part of ax(bxc) -----> a1b1c3 - a2b22c3 + a2b3c2
    then look at the last part ( - (b.a)c ---> a1b3c1 - a1b1c3 + a2b3c2 - a2b2c3

    You see only 1 term isn't match up!! the a1b1c3 not equal to a1b3c1 whats going on? Thanks
  2. jcsd
  3. Nevermind, my friend found the problem! I forgot a term in ax(bxc) part.
Know someone interested in this topic? Share a link to this question via email, Google+, Twitter, or Facebook

Have something to add?