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    here's a thread where you can post the best maths illusions. Please feel free to post illusions.

    Here's mine. tell me what you think of it

    a = b
    times both sides by b
    ab = b2
    minus a2
    ab – a2 = b2 – a2
    factorise
    a(b-a) = (b+a)(b-a)
    divide by (b-a)
    a = b+a
    replace b by a
    a = a + a
    a = 2a
    divide by a
    1 = 2



    If 1 = 2, the world would end
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    oh dear.
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    Dear oh dear.
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    Haha, quite good.
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    (Original post by mockel)
    Dear oh dear.
    This should be moved to GC, like you suggested, to amaze the commoners. :cool:
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    (Original post by endeavour)
    This should be moved to GC, like you suggested, to amaze the commoners. :cool:
    It probably should. I have used it to amaze some rather stupid people in my class before . I dont expect anyone here to fall for it.
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    Mathematical proof that women are evil???

    Women take time and money, so:
    Women = Time x Money

    Any decent businessman will tell you time is money:
    Women = Money x Money

    Money is the root of all evil:
    Women = √Evil x √Evil

    But if you mulitiply a square root by it's own square root you get itself, so:
    Women = Evil
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    If you replace b with a then you're putting a different number in, right?

    I'm gonna sound so stupid but I don't get it the thing doesn't make sense...

    and no I'm not dumb I'm just unbelievably CRAP at Maths.
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    How about this one, it uses the imaginary number i^2=-1:
    -1 = -1
    1/-1 = -1/1
    sqrt(1/-1) = sqrt(-1/1)
    1/i = i/1
    1 = i^2
    1 = -1

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    (Original post by corkskrew)
    Mathematical proof that women are evil???

    Women take time and money, so:
    Women = Time x Money

    Any decent businessman will tell you time is money:
    Women = Money x Money

    Money is the root of all evil:
    Women = √Evil x √Evil

    But if you mulitiply a square root by it's own square root you get itself, so:
    Women = Evil
    Men cost time and money too! - so using your logic: Men = Evil

    Men : Women
    Evil : Evil
    Which cancels each other out

    You see, men and women - it's meant to be - they're complimentary!
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    (Original post by irisng)
    If you replace b with a then you're putting a different number in, right?
    my first line was a=b, so no.
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    (Original post by irisng)
    Men cost time and money too! - so using your logic: Men = Evil

    Men : Women
    Evil : Evil
    Which cancels each other out

    You see, men and women - it's meant to be - they're complimentary!
    I would say women take much more time and money up then men.
    Men = time x money = money x money = √evil x √evil = evil
    Women = time² x money² = money² x money² = evil x evil = evil²

    Basically to cure world poverty kill women.
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    (Original post by Zuber)
    I would say women take much more time and money up then men.
    Men = time x money = money x money = √evil x √evil = evil
    Women = time² x money² = money² x money² = evil x evil = evil²

    Basically to cure world poverty kill women.
    :eek: Well I suppose that would in effect terminate the human race

    Women tend to give a lot more into a relationship though, generally speaking - so it cancels everything out again.

    And I'm sure there're some men who won't thank you for killing all women
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    Men are more evil than women...
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    well science has been developing techniques to make babies from 2 men or women. (i.e. fuse 2 ova nuclei or 2 sperm nuclei and insert into an enucleated egg). so we probably wouldnt be terminated.
    And women tend to give more in a relationship??? utter lies. on the whole men and women give into relationships equally.
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    (Original post by irisng)
    If you replace b with a then you're putting a different number in, right?

    I'm gonna sound so stupid but I don't get it the thing doesn't make sense...

    and no I'm not dumb I'm just unbelievably CRAP at Maths.
    I'll give you a (big) hint: the problem occurs when dividing through by (b-a).
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    (Original post by Zuber)
    here's a thread where you can post the best maths illusions. Please feel free to post illusions.

    Here's mine. tell me what you think of it

    a = b
    times both sides by b
    ab = b2
    minus a2
    ab – a2 = b2 – a2
    factorise
    a(b-a) = (a+b)(a-b)
    divide by (b-a)
    a = a+b
    replace b by a
    a = a + a
    a = 2a
    divide by a
    1 = 2



    If 1 = 2, the world would end
    there are three very obvious stupid mistakes with this. firstly you've factorised wrong. here's the corrected version:
    ab - a² = b² - a²
    a(b - a) = (b - a)(b + a)
    at this line you had (a - b)(b + a)

    now of course, you can tell me that a = b and hence you can have b - a. well, ok let's pretend that you're right and continue with your method.

    so we have a(b - a) = (a - b)(b + a)
    you want to divide by (b - a). well you can't. if a = b, then b - a = 0, and you cant divide by zero. but you have, hence the answer is undefined.

    well let's continue anyway.
    a = 2a
    divide by a: 1 = 2. this can't exist, hence a must equal zero and hence a = 2a.

    without being harsh, i suggest you relearn your basic algebra, because you've made some very simple mistakes and it'll be quite easy to fix.

    i'll post some interesting maths after i get back from this morning's tripos exam (which, funny enough, is maths).

    edit: mop's beaten me to the correct answer :p: another cambridge genius i've realised i can't even post what i wanted to because they don't have the correct symbols so i'll post in words
    e^i(theta) = cos(theta) + isin(theta)
    woo
    which gives my fave equation
    e^i.pi +1 = 0
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    *Pats Lozza on the head* re-read the sixth post in this thread :p:
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    (Original post by Lozza)
    there are three very obvious stupid mistakes with this. firstly you've factorised wrong. here's the corrected version:
    ab - a² = b² - a²
    a(b - a) = (b - a)(b + a)
    at this line you had (a - b)(b + a)

    now of course, you can tell me that a = b and hence you can have b - a. well, ok let's pretend that you're right and continue with your method.

    so we have a(b - a) = (a - b)(b + a)
    you want to divide by (b - a). well you can't. if a = b, then b - a = 0, and you cant divide by zero. but you have, hence the answer is undefined.

    well let's continue anyway.
    a = 2a
    divide by a: 1 = 2. this can't exist, hence a must equal zero and hence a = 2a.

    without being harsh, i suggest you relearn your basic algebra, because you've made some very simple mistakes and it'll be quite easy to fix.

    i'll post some interesting maths after i get back from this morning's tripos exam (which, funny enough, is maths).

    edit: mop's beaten me to the correct answer :p: another cambridge genius i've realised i can't even post what i wanted to because they don't have the correct symbols so i'll post in words
    e^i(theta) = cos(theta) + isin(theta)
    woo
    which gives my fave equation
    e^i.pi +1 = 0


    :eek: :eek: :eek: :eek: :eek:
    the math man is here
    numbers war started
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    (Original post by Mop)
    *Pats Lozza on the head* re-read the sixth post in this thread :p:
    haha ok, didn't realise he actually knew he was being dumb. it really does look like something my little sister would write down tho :eek:

    oh i really hope there's a nice matrix question today.
 
 
 
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