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View Poll Results: how are you at math?

Voters
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  • I am NFP: talented

    14 15.91%
  • I am NFP: above average

    14 15.91%
  • I am NFP: average

    7 7.95%
  • I am NFP: below average

    2 2.27%
  • I am NFP: I suck at math

    12 13.64%
  • I am NFJ: talented

    10 11.36%
  • I am NFJ: above average

    15 17.05%
  • I am NFJ: average

    9 10.23%
  • I am NFJ: below average

    3 3.41%
  • I am NFJ: I suck at math!

    2 2.27%
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Results 81 to 83 of 83

  1. #81

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    Quote Originally Posted by Chloee View Post
    yep, i read it now, it's true.
    that prove was 2003 in National competition in math here in Croatia for 1st year High School. i did it the same as you did until
    1 b*p[(a2 -bc) + (b2-ac) + (c2-ab)] >= 0
    then i've put
    2 (a-b)*2= a2-2ab+b2 >= 0
    3 (b-c)*2= b2-2bc+c2 >= 0
    4 (c-b)*2= c2-2bc+b2 >= 0
    since 2+3+4
    is (2a2-2bc)+(2b2-2ac)+(2c2-2ab)>=0 which makes 1 true, after you divide it with 2 etc.

    i like it because you dont have to have any real knowledge to do it, besides basic calculus. inequalities were always most interesting thing in math to me.
    Your way is simpler. I just typed out what popped into my head. Thought I think you made a typo on the fourth line.

    Shouldn't it be 4 (c-a)^2= c^2-2ac+a^2 >= 0 ?

    Accept the past. Live for the present. Look forward to the future.
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    "As our island of knowledge grows, so does the shore of our ignorance." John Wheeler
    "[A] scientist looking at nonscientific problems is just as dumb as the next guy." Richard Feynman
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  2. #82
    Senior Member Chloe's Avatar
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    May 2009
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    2,204

    Default

    Quote Originally Posted by ygolo View Post
    Your way is simpler. I just typed out what popped into my head. Thought I think you made a typo on the fourth line.

    Shouldn't it be 4 (c-a)^2= c^2-2ac+a^2 >= 0 ?
    yep, typo

  3. #83
    Senior Member LostInNerSpace's Avatar
    Join Date
    Jan 2008
    MBTI
    INTP
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    1,027

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    Quote Originally Posted by Chloee View Post
    yep, i read it now, it's true.
    that prove was 2003 in National competition in math here in Croatia for 1st year High School. i did it the same as you did until
    What does that say? It says if you want to be good a doing proofs, do a lot of proofs. Personally I'd rather stick a pencil where it does not belong. That's why I'm more drawn towards the mathematical physics way of doing math. Mathematical physicists are not so anal about rigorous proof. Not that I've done a whole lot of it yet. My scouting reveal mathematical physics as an area I might want to focus on. There are plenty of other people to worry about the proofs.

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