IF you would like help with any math problems, feel free to post them

Maths and statistics discussion, revision, exam and homework help.

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  1. TheMagicMan's Avatar
    • Overlord in Training
    • Posts: 2,940
    Re: IF you would like help with any math problems, feel free to post them
    (Original post by Dog4444)
    I found a good problem, but I can't manage to solve it. It supposed to be pretty easy one:

    Prove that there are infinitely many positive integers n such that n^2-1 has a prime divisor greater than  2n+\sqrt{2n}

    Help!
    I don't think this is true....
  2. Dog4444's Avatar
    • Exalted and Worshipped Member
    • Posts: 968
    Re: IF you would like help with any math problems, feel free to post them
    (Original post by TheMagicMan)
    I don't think this is true....
    Definitely true.
  3. TheMagicMan's Avatar
    • Overlord in Training
    • Posts: 2,940
    Re: IF you would like help with any math problems, feel free to post them
    (Original post by Dog4444)
    Definitely true.
    n^2-1=(n+1)(n-1) so the greatest prime divisor it can have is n+1. As n+1 < 2n for n >1, there are no numbers for which it is true...
  4. Dog4444's Avatar
    • Exalted and Worshipped Member
    • Posts: 968
    Re: IF you would like help with any math problems, feel free to post them
    (Original post by TheMagicMan)
    n^2-1=(n+1)(n-1) so the greatest prime divisor it can have is n+1. As n+1 < 2n for n >1, there are no numbers for which it is true...
    Holy ****
    Typo from me.
    It's n^2+1
    Thousand apologises.
  5. FrozenBeak's Avatar
    • Benevolent Member
    • Posts: 889
    Re: IF you would like help with any math problems, feel free to post them
    (Original post by DFranklin)
    You are reminded to read the Guide to Posting, and in particular what it has to say about posting full solutions.
    Ohh shut up man..seriously..this guy has offered his time, skills and experience in helping the students with maths which they are struggling to complete. A step by step guidance which s/he is actually giving, as well as the answer, personally is also helping me. What's the point in posting how to work something out, and not giving the answer for it...it's called knowing if the student will be right or not? Jesus christ...

    I bet if you were not a moderator and such ignorant on someones offer i.e. the OP, you would be asking the same kind of questions with the request of the answers.


    @Students - Like if you agree to my post.
  6. raheem94's Avatar
    • TSR Demigod
    • Posts: 5,512
    Re: IF you would like help with any math problems, feel free to post them
    (Original post by FrozenBeak)
    Ohh shut up man..seriously..this guy has offered his time, skills and experience in helping the students with maths which they are struggling to complete. A step by step guidance which s/he is actually giving, as well as the answer, personally is also helping me. What's the point in posting how to work something out, and not giving the answer for it...it's called knowing if the student will be right or not? Jesus christ...

    I bet if you were not a moderator and such ignorant on someones offer i.e. the OP, you would be asking the same kind of questions with the request of the answers.


    @Students - Like if you agree to my post.
    It would have been better had you conveyed your point by being less rude.

    I accept the OP has taken his time to help students. But their are certain flaws of it as well, some students might just give their homework question for the OP to do, and they will then copy without trying to understand it.

    DFranklin is a moderator and its his responsibility to point out if there is a rule being broken. He has to follow the forum rules, and ensure nothing against the rules is posted on the forum.

    Personally, i really appreciate the effort of the OP.

    What's the point in posting how to work something out, and not giving the answer for it
    If you are told the method to work something out, then you should use that method to work out the answer, and then tell your answer so that others can check and inform if you are right or wrong.

    And IT WILL BE BETTER IF YOU KEEP YOUR OPINIONS TO YOURSELF, SUCH POSTS WON'T HELP ANYONE.
    Last edited by raheem94; 31-03-2012 at 23:37.
  7. Brit_Miller's Avatar
    • Benevolent Member
    • Location: Bristol
    • Posts: 686
    Re: IF you would like help with any math problems, feel free to post them
    (Original post by raheem94)
    It would have been better had you conveyed your point by being less rude.

    I accept the OP has taken his time to help students. But their are certain flaws of it as well, some students might just give their homework question for the OP to do, and they will then copy without trying to understand it.

    .
    Top notch at maths, but terrible English.
  8. raheem94's Avatar
    • TSR Demigod
    • Posts: 5,512
    Re: IF you would like help with any math problems, feel free to post them
    (Original post by Brit_Miller)
    Top notch at maths, but terrible English.
    Everybody can make mistakes, i didn't read it well, to eliminate mistakes.
  9. Brit_Miller's Avatar
    • Benevolent Member
    • Location: Bristol
    • Posts: 686
    Re: IF you would like help with any math problems, feel free to post them
    (Original post by raheem94)
    Everybody can make mistakes, i didn't read it well, to eliminate mistakes.


    Just ribbing, fella.
  10. starfish232's Avatar
    • Respected Member
    • Location: London
    • Posts: 196
    Re: IF you would like help with any math problems, feel free to post them
    I was wondering if someone could please help me with part B of following C2 log question attached as I'm not sure how to go about solving it.

    Thanks
    Attached Thumbnails
    Click image for larger version. 

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  11. TenOfThem's Avatar
    • TSR Royalty
    Re: IF you would like help with any math problems, feel free to post them
    Use (a) to substitute the LHS

    remove the logs

    you have simultaneous equations
  12. oh_1993's Avatar
    • Benevolent Member
    • Posts: 673
    Re: IF you would like help with any math problems, feel free to post them
    How can I prove that this has no solutions for n=3,4,5... where x,y and z are integers?

    \displaystyle x^n+y^n=z^n
  13. Dog4444's Avatar
    • Exalted and Worshipped Member
    • Posts: 968
    Re: IF you would like help with any math problems, feel free to post them
    (Original post by oh_1993)
    How can I prove that this has no solutions for n=3,4,5... where x,y and z are integers?

    \displaystyle x^n+y^n=z^n
    Ok, I got it.
    Last edited by Dog4444; 11-04-2012 at 15:05.
  14. ThatPerson's Avatar
    • Peer Of The TSR Realm
    • Posts: 1,432
    Re: IF you would like help with any math problems, feel free to post them
    (Original post by sulexk)
    Hi,

    That is to do with functions of complex variables. I will try and work on it, although have not yet covered Functions of Complex variables. Will try soon though!
    I would love to work on these in the summer, once all exams are done.
    Just want to make sure that you know; that is the Riemann Hypothesis and hasn't be solved for over 150 years and counting.

    But you could try
  15. notnek's Avatar
    • TSR Demigod
    • Location: Bangkok, Thailand
    Re: IF you would like help with any math problems, feel free to post them
    When Sulexk manages to solve all the problems in this thread and becomes famous around the world, we can all look back at this thread and remember that "this was where it all started".
  16. oh_1993's Avatar
    • Benevolent Member
    • Posts: 673
    Re: IF you would like help with any math problems, feel free to post them
    (Original post by Dog4444)
    Ok, I got it.
    :qed: ?
  17. Smiley Face :)'s Avatar
    • Exalted Member
    • Posts: 347
    Re: IF you would like help with any math problems, feel free to post them
    http://www.thestudentroom.co.uk/show....php?t=1969325
    My q is up here ... please can u help me ??
  18. Smiley Face :)'s Avatar
    • Exalted Member
    • Posts: 347
    Re: IF you would like help with any math problems, feel free to post them
    Hi, working on this q for a while... needhelp please...

    A heaving ring of mass 5 kg is threaded on a fixed rough rod. Coefficient of friction between rod and ring is 1/2... A light string is attatched to the string and pulled down at 30 degrees to the horizontal. The magnitude of force T from the light rope is increases from 0. Find the value of T that is just suffiecient to make the equilibrium limiting..

    I worked out friction was 24.5 (5x9.8x0.5)
    Then I worked out the the horizontal force of the string would be Tcos(30)
    So i did
    Tcos(30)- 24.5 = 0
    Thus, T =28.3 N
    The answer is actually 39.8... Where am i going wrong please??
    Click image for larger version. 

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  19. Intriguing Alias's Avatar
    • TSR Idol
    • Location: Yorkshire
    Re: IF you would like help with any math problems, feel free to post them
    Been stuck on this one all day:

    Is it true that every problem whose solution can be quickly verified by a computer can also be quickly solved by a computer?


    Spoiler:
    Show
  20. Bobifier's Avatar
    • TSR Demigod
    • Location: England
    • Posts: 5,613
    Re: IF you would like help with any math problems, feel free to post them
    (Original post by oh_1993)
    How can I prove that this has no solutions for n=3,4,5... where x,y and z are integers?

    \displaystyle x^n+y^n=z^n
    I have an elegant proof but this post is not large enough to contain it.
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