Nerdus's Math Help Thread

Discussion in 'General discussion' started by Nerdus Pegasus, Apr 6, 2013.

  1. Nerdus Pegasus

    Nerdus Pegasus A Pony Every Pony Should Know
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    You can always start early. Better now than 2 days before the test.
    Learning some math now means that you can simply review it later, instead of having to learn it right before the test.
    You may call it "relearning," but I believe that little bits and pieces will stick with you, and then you can simply review it to put the pieces back together.
     
  2. Hero Mode

    Hero Mode I like Rarity, that is all

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    Don't worry I plan to practice my math during the Summer.
     
  3. VG_Addict

    VG_Addict A Pony Every Pony Should Know
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    I graduated from high school. I guess it's too late for me to learn calculus.
     
  4. mike406

    mike406 Moderator
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    You can take calculus courses at universities, or just learn it yourself online.
     
  5. Nerdus Pegasus

    Nerdus Pegasus A Pony Every Pony Should Know
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    Sorry, I don't know calculus yet. I cannot help you with that.

    Alright, I'll most likely be here for that. :)

    While it may be hard to figure it out yourself, you could teach yourself calculus.
    I don't know calculus, so I cannot teach you.
     
  6. Nerdus Pegasus

    Nerdus Pegasus A Pony Every Pony Should Know
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    Alrighty, I hope it goes well.
     
  7. SaulLaski

    SaulLaski AKA SquishyGoodness
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    USELESS POST AHEAD.

    I finished school's math program just because i hadn't got any skills in this.
    HOWEVER, try to solve this:
    Here we are going to consider polynomial vector fields in the real plane, that is a system of differential equations of the form:
    [​IMG]where both P and Q are real polynomials of degree n.
     
  8. Nerdus Pegasus

    Nerdus Pegasus A Pony Every Pony Should Know
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    First off, I do not know very much about calculus. I can't really help with this (but it doesn't mean I can't try).

    I'll do a bit of research on this, and wait for the actual problem to be solved.
    (I don't really know if I am supposed to solve [​IMG], or what I'm supposed to solve in it. )
     
    #28 Nerdus Pegasus, Jul 9, 2013
    Last edited: Jul 9, 2013
  9. mike406

    mike406 Moderator
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    Using Chain Rule, we can get:

    dy/dt = (dy/dx)(dx/dt)

    Simplified to:

    dy/dx = (dy/dt)/(dx/dt)

    Therefore (Expressed as an ordinary differential equation:):

    dy/dx = [Q(x,y)]/[P(x,y)]

    Is that what you're looking for? I'm not too sure what you want us to do with this to be honest...
     
    #29 mike406, Jul 9, 2013
    Last edited: Jul 9, 2013
  10. SaulLaski

    SaulLaski AKA SquishyGoodness
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    Neither am i, it's just a little something one of my friends passed me. He's studying a specific field of mathematics at some university, and often has to calculate equations with infinities, or quantum theories... (It's a kind of philosophic program too)
    And, don't think too much about that problem. Just consider it a challenge you can decline, nothing more.
     
  11. Nerdus Pegasus

    Nerdus Pegasus A Pony Every Pony Should Know
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    Despite my lack of knowledge in calculus, I didn't see what I needed to solve, either.

    - - Auto Merge - -

    Calculating equations with infinities sounds like he's dealing with infinite series, or dealing with limits, where infinity and infinitesimals pop up often.
    Anyways, it's not really a problem, as we don't know what is to be solved.

    Still, if you have anything else to ask, don't be afraid to ask them.
     
  12. SaulLaski

    SaulLaski AKA SquishyGoodness
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    I posted an equation, not a problem.

    (okay, that was kind of troll. I'm sorry.)
    On the other hand, a famous math problem that has quite a catch:
    6/2(1+2)=?

    My solution:
    6/2(1+2)=x
    6/2(3)=x
    6/6=x
    1=x

    Makes sense? Some people said the answer was 9.
     
  13. mike406

    mike406 Moderator
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    Remember that the Order of Operations specifies that Multiplication and Division (as well as Addition and Subtraction) have equal left-to-right precedence
    PEMDAS is really written as (same applies with BODMAS)

    P
    E
    MD
    AS

    With that said the answer will be 9

    6/2(1+2) will be separated as

    (1+2) = 3

    6/2 = 3

    3*3 = 9

    It's simply 6 / 2 * 3

    You are implying an unequal precedence of Multiplication and Division. You cannot make implications like that, you will be wrong on exams!

    To properly show this you would need to re-write the original equation to override equal precedence:

    6/[2(2+1)]

    This will equal 1 :smile:


    Here is a fun thinker:

    Let's say we have a 1 kilometer rope that can hypothetically be stretched forever. The left end is attached to a wall, the right end attached to a car. An ant sits on the left end of the rope and begins walking toward the car the same time the car begins to drive and pull the rope. The car is driving 1 kilometer per second such that after 1 second the rope would equal 2 kilometers, after 2 seconds the rope would be 3 km long and so on. The ant walks at the speed of 1 centimeter per second. Will the ant ever reach the car?
     
    #33 mike406, Jul 9, 2013
    Last edited: Jul 10, 2013
  14. Nerdus Pegasus

    Nerdus Pegasus A Pony Every Pony Should Know
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    Hehe, I know this one. I won't spoil it. I want others to try it first.
    (Yeah, YOU THERE! Try math outside of school for once!)
     

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