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Hello! PF users I'm new here

  1. Aug 4, 2014 #1
    Hi!
    I'm new here and seek some puzzles
    for my mind.
     
  2. jcsd
  3. Aug 4, 2014 #2
    No! one!
     
  4. Aug 4, 2014 #3
    All one will do is make you hungry. If you are hungry, you will need to eat. What is your favorite fish?
     
  5. Aug 4, 2014 #4
    Welcome Mr.maniac!

    Here is a puzzle

    At the recent PF Festival, the 100 metres heats were closely monitored.

    Each contestant had to run in two races so that the average place could be determined.

    Only one runner finished in the same place in both races.

    Alan was never last. Charlie always beat Darren. Brian had at least one first place. Alan finished third in at least one of the races. Both Darren and Charlie had a second place.

    What were the two results?
     
  6. Aug 4, 2014 #5

    micromass

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    Well, if you want a puzzle, why don't you try the Hardest Logical Puzzle Ever:

     
  7. Aug 4, 2014 #6

    jtbell

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    Speaking of fish and puzzles, a Google search for "fish puzzle" turned up the following:

    http://web.stanford.edu/~laurik/fsmbook/examples/Einstein'sPuzzle.html

    (And by the way, what's your favorite fish? :smile:)
     
  8. Aug 4, 2014 #7

    micromass

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    Here is an extremele tough one:

     
  9. Aug 4, 2014 #8

    micromass

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    Yet another one:

     
  10. Aug 4, 2014 #9

    micromass

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    This is one of my favorites:

     
  11. Aug 4, 2014 #10

    Borek

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    You may also try proving that the real part of every non-trivial zero of the

    [tex]\zeta(s) = \frac{1}{\Gamma(s)} \int_{0}^{\infty} \frac{x ^ {s-1}}{e ^ x - 1} \mathrm{d}x[/tex]

    function is 1/2.
     
  12. Aug 4, 2014 #11

    DataGG

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    And he'll never join PF again...
     
  13. Aug 4, 2014 #12

    jtbell

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    I guess this is our new "puzzle-slapping" initiation ritual. :uhh:
     
  14. Aug 4, 2014 #13

    micromass

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    We should request everybody wanted to join to solve one of the above puzzles as anti-spam measure :biggrin:
     
  15. Aug 4, 2014 #14

    WannabeNewton

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    Fighting spam with spam: didn't Gandhi have something against that?
     
  16. Aug 4, 2014 #15
    As per the precedent set in the Enjoyable Enigmas thread I am permitted to ask clarifying questions.

    You describe the races as "heats". By that you mean: "a less important race or competition in which it is decided who will compete in the final event," correct? 4 contestants are named, so I assume that is the total number of participants. It is asserted that each ran two races, therefore the total number of "heats" was 2, and each of the 2 heats had the same 4 contestants, correct?
     
  17. Aug 4, 2014 #16
    Greg's
    n=4
    A!=4 (1,2)
    C<D
    :.C!=4 (1,2)

    B=1(1&/2)

    1......2
    1 C . 1 B
    2 D . 2 C
    3 A . 3 A
    4 B . 4 D

    or in English- race a) 1 Charlie 2 Darren 3 Alan 4 Brian
    race b) 1 Brian 2 Charlie 3 Alan 4 Darren
    ?
     
  18. Aug 4, 2014 #17
    It is better to spam, if there is spam in our hearts, than to put on the cloak of non-spamming to cover impotence.
     
    Last edited: Aug 4, 2014
  19. Aug 4, 2014 #18
    Hey guys, new to the forum.

    Just wanted to say I really enjoyed the puzzles and can tell that there is a good bunch of smarts around, look forward to discussions with you involved.

    P.S. any more puzzles? ;)
     
  20. Aug 6, 2014 #19
    Heat1: 1st Charlie 2nd Darren 3rd Alan 4th Brian
    Heat2: 1st Brian 2nd Charlie 3rd Alan 4th Darren
     
  21. Aug 6, 2014 #20

    Ryan_m_b

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    1st race: Charlie, Darren, Alan, Brian
    2nd race: Brian, Charlie, Alan, Darren

    Taking the average: Charlie, Brian, then Alan and Darren are joint.

    But PF would never have such a shoddily designed tournament! Everyone knows that it's three repeats minimum :tongue2:
     
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