• Robust Mirror@aussie.zone
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    1 month ago

    987654312÷123456789

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

  • grrgyle@slrpnk.net
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    1 month ago

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

    • driving_crooner@lemmy.eco.br
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      1 month ago

      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.

    • GraniteM@lemmy.world
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      1 month ago

      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