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[–] 78 points 1 year ago (18 children)

Shit like this makes me realise why people become mathematicians. You just play around with numbers and find funny facts about them.

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  • [–] 51 points 1 year ago* (last edited 1 year ago) (2 children)

    So, years ago in college in Linear Algebra our professor said to us to study about idempotent matrices. So I checked out that wiki page and saw the example for 2x2 matrix, that are composed by the numbers 3, -6, 1 and -2. And I was like wait a second, 3×-2=-6 there's no way they are not relationship there, so I started trying other numbers, and found and proved (using induction) that any n, -n(n-1), 1, -(n-1) is an idempotent matrix. At the test there were no questions about that, and I was short of 0.5 poits to pass the class without having to present a final exam and I told my professor that I spent a lot of time learning that and that even discovered something and proved he pass me the chart and asked me to proved it, after that he gave the missing points. Was really good.

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  • [–] 16 points 1 year ago (7 children)

    I myself once learned 380 digits of π, when I was a crazy high-school kid. My never-attained ambition was to reach the spot, 762 digits out in the decimal expansion, where it goes "999999", so that I could recite it out loud, come to those six 9s, and then impishly say, "and so on!"

    —Douglas Hofstadter

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    [+] 74 points 1 year ago* (last edited 1 year ago) (12 children)
  • [–] 17 points 1 year ago (2 children)

    For that last one, how bad are we talking? I need to know soon, I have some important banking software I need to develop.

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  • [–] 46 points 1 year ago (8 children)

    gonna need this in every base

    I'll start with base 2:

    1/1 = 1

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  • [–] 33 points 1 year ago (1 child)

    I just noticed what the numbers are. It really is easy to memorize. So convenient.

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    [–] 23 points 1 year ago (2 children)

    987654312÷123456789

    Change the 21 at the end of the first number to 12 and its perfect. It was only ever 9 away.

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  • [–] 20 points 1 year ago

    The funniest part is that some people will never understand the absolute crusade that some mathematicians might fight over this one day

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  • [–] 16 points 1 year ago (6 children)

    I wonder if there’s a related infinite sequence which converges on 8?

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  • [–] 21 points 1 year ago (4 children)

    This sequence approximates an integer to arbitrary precision, not 8 specifically though, and never perfectly.

    I tried it out using other bases, and the rule seems to be that doing this in base n results in n-2 with remainder n-1. So it doesn't ever actually converge, but the remainder becomes small very fast.

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  • [–] 11 points 1 year ago (3 children)

    never perfectly

    eyes you in binary

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  • [–] 14 points 1 year ago

    9876543210987654321 / 1234567890123456789 = 8,0000000729000

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  • [–] 11 points 1 year ago (1 child)

    You may call it an approxim8ion

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  • [–] 5 points 1 year ago (1 child)
  • [–] 5 points 1 year ago* (2 children)

    It contains the number 8 though. So how is that useful

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    [–] 3 points 1 year ago
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