A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 4 years ago

I have a question about notation. Just let me write it out.

  • This Question is Closed
  1. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    \[3x^2 >= 0\] \[\forall x \] (three dots like a triangle upside down) x^2 is always positive. Sorry for the line spacing, it should all be on one line. Would this read: "3x^2 is more than or equal to 0 for all x because x^2 is more than or equal to zero" ?

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

    |dw:1328399150129:dw|

  3. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Thank you, but it was the latter part I wasn't sure about. For all x And the triangle ( http://en.wikipedia.org/wiki/Because_sign )

  4. Zarkon
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    \[3x^2\ge0 \hspace{.5cm}\forall x,\hspace{.2cm}\because x^2\ge 0\]

  5. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Thank you! Is that correct notation? I mean would it "grammaticly" correct?

  6. precal
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    are you trying to do set builder notation?

  7. Zarkon
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    yes

  8. precal
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Are you trying to determine the solution of that inequality?

  9. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    The original problem was. Prove that x^3 - ax is increasing for all x if a < 0 But I wanted to use proper notation.

  10. precal
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1328399454066:dw|

  11. precal
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1328399493672:dw|

  12. precal
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Is this calculus, where you are proving intervals that are increasing and decreasing?

  13. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Yes this calculus, but the calculus wasn't the problem, it was just the notation

  14. precal
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Usually when you are asked to prove an increasing or decreasing interval. Step 1: You take the derivative of the given function Step 2: You take that equation and set it equal to zero and solve the solutions that are positive represent increasing the solutions that are negative represent decreasing I am not sure you were on the correct track Nevermind what you solution is, the professor would have realized that you were not doing the problem correctly. Stating the wrong solution correctly does not make the solution correct. In mathematics we look for the correct process, correct solutions and correct mathematical notation ie set builder notation

  15. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

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.