Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

xcrypt Group Title

In this page: http://en.wikipedia.org/wiki/Projection_(linear_algebra)#cite_note-0 (and in my book) In linear algebra and functional analysis, a projection is a linear transformation P from a vector space to itself such that P^2 = P What is the meaning of P^2 here?

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. estudier Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    No sure what u mean, isn't it just as it says at the top of http://en.wikipedia.org/wiki/Projection_(linear_algebra) ie P^2 = P(P(v))

    • 2 years ago
  2. xcrypt Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I don't mean anything, I'm asking what is meant by it. It might be what you claim, but how is this operation called (at first I thought it was cartesian product or something), and where do you see it at the top?

    • 2 years ago
  3. estudier Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Here http://en.wikipedia.org/wiki/Projection_(linear_algebra)#Simple_example

    • 2 years ago
  4. xcrypt Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I found what is meant by it: http://en.wikipedia.org/wiki/Function_composition

    • 2 years ago
  5. estudier Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    P(P(v)) IS function composition....:-)

    • 2 years ago
  6. phi Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    P is a projection matrix. if you have a vector x Px will give you a vector in some subspace. if x is already in that subspace then you would get x= Px if we sub n Px for x in the equation x=Px we get x= PPx from which we see Px= PPx or P= P^2

    • 2 years ago
  7. xcrypt Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    @ estudier yeah it's a function composition but you didn't tell me what it was called at first :)

    • one year ago
  8. estudier Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    True, you didn't ask for that, though, u asked for the meaning...

    • one year ago
  9. xcrypt Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I did ask for it, but it's no problem really :D

    • one year ago
  10. estudier Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    K

    • one year ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.