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Thread: 1 = .9999.....

  1. #121
    Eggstreme Wheelie Recognized Member Jiro's Avatar
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    I wish I was smart enough to take all this higher level maths. It is quite brilliant, I just fail at grasping it.

    I'll try to explain the concept for everyone who, like me, has no idea what is going on and you smarter people tell me if I'm correct.

    Even though .9... is not a rational number, it is still equal to the number 1, as there is no number between them. Y/N? Also, does this mean that 1 == 1.1..., and therefore .9...==1.1...?

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  2. #122
    A Big Deal? Recognized Member Big D's Avatar
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    Quote Originally Posted by Jiro View Post
    Even though .9... is not a rational number, it is still equal to the number 1, as there is no number between them. Y/N?
    Y
    Also, does this mean that 1 == 1.1..., and therefore .9...==1.1...?
    Nope, 'cause 1.1 recurring is higher than 1.1, which is higher than 1.09, and so on. You can get numbers that are lower than 1.1..., but higher than 1.

  3. #123
    Eggstreme Wheelie Recognized Member Jiro's Avatar
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    Yeah, I thought about that, but wasn't sure.

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  4. #124
    yuno's Avatar
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    hey,0.999... is in fact rational,because it is a repeating decimal.
    "I'll tell you one thing... The truly mighty ones don't flaunt their power. How can I describe it to you? The sly eagle hides its claws."
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  5. #125
    Shlup's Retired Pimp Recognized Member Raistlin's Avatar
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    Quote Originally Posted by Jiro View Post
    Even though .9... is not a rational number, it is still equal to the number 1, as there is no number between them. Y/N? Also, does this mean that 1 == 1.1..., and therefore .9...==1.1...?
    No. 0.999... is a rational number because it is a repeating decimal that can be represented as a relationship between two integers (9/9, or 1).

    And how do you conclude that 1 = 1.1...? 1.1... is 10/9, not 1. And that's easy to see, because there's an infinite amount of numbers between 1 and 1.1... (i.e., 1.01, 1.001, 1.0001, etc.).

  6. #126
    Eggstreme Wheelie Recognized Member Jiro's Avatar
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    I don't conclude anything, I was trying to make sense of it because my brain is smaller than everyone else's on here ^__^

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  7. #127
    Shlup's Retired Pimp Recognized Member Raistlin's Avatar
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    This is rather counter-intuitive. At least you're accepting it instead of vehemently arguing against it. Ignorance by itself and be forgiven and rectified.

  8. #128
    Draw the Drapes Recognized Member rubah's Avatar
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    jiro, try 1.099999999999999999999999999999999999etc = 1.1

  9. #129
    Your very own Pikachu! Banned Peegee's Avatar
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    Considering how many people tend to argue against this equality, is the equality very easily understood by mathematicians / math students of a certain level?

    I am just imagining a room full of professors arguing that 0.9999... is not equal to 1

  10. #130
    Shlup's Retired Pimp Recognized Member Raistlin's Avatar
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    Nah, I doubt any serious math professors argue about this ever, because it's been very conclusively demonstrated. It's only counter-intuitive until you understand limits, and then it all fits. So basically, only lay people tend to argue about it, as shown by the biggest arguments about this are found on video game message boards.

  11. #131

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    I didn't even think this would be argument worthy. I was just really bored and, for some reason or another, remember that one guy in my Trig Class getting all uppity about it not being true. XD

  12. #132
    That's me! blackmage_nuke's Avatar
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    0.999 is definitely equal to 1, anyone who said otherwise in this thread is a raving lunatic
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  13. #133
    One Hundred Chimneys Recognized Member Tavrobel's Avatar
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    Quote Originally Posted by Raistlin View Post
    Nah, I doubt any serious math professors argue about this ever, because it's been very conclusively demonstrated. It's only counter-intuitive until you understand limits, and then it all fits. So basically, only lay people tend to argue about it, as shown by the biggest arguments about this are found on video game message boards.
    Professors only ever talk about this on the first day of introducing series and sequences (if that). Otherwise, students go to their Discussion classes, the topic is brought up, and the TA simply goes on and proves it, to the amazement of all of the math students in the classroom. Frequently, the only expression to explain it is "oo," "cool," and "awesome." There's no objection, because it's trivial.

    More people in this thread just need their Calculus II.

  14. #134
    Eggstreme Wheelie Recognized Member Jiro's Avatar
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    Quote Originally Posted by Raistlin View Post
    This is rather counter-intuitive. At least you're accepting it instead of vehemently arguing against it. Ignorance by itself and be forgiven and rectified.
    I'm not going to argue against something that requires knowledge outside of my own to understand. One day I hope to fully understand why, rather than just knowing it's true.

    Still, I find it funny that so many people argue the point.

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  15. #135

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    Quote Originally Posted by blackmage_nuke View Post
    0.999 is definitely equal to 1, anyone who said otherwise in this thread is a raving lunatic
    Incorrect sir. 0.999 equals no such thing.

    0.999... however equals one.

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