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19,367 Views • Aug 8, 2024 • Click to toggle off description
This is a short, animated visual proof showing the sum of the infinite geometric series with first term 8/9 and ratio 1/9, which in turn allows us to compute the sum of the series of powers of 1/9 and determine an interesting base 9 representation of 1.

If you like this video, consider subscribing to the channel or consider buying me a coffee: www.buymeacoffee.com/VisualProofs. Thanks!

For a longer, wordless version (more dramatic) of this animation see
   • Geometric series: sum of powers of 1/...  

Also, check out my playlist on geometric sums/series:    • Geometric Sums  

This animation is inspired by the a proof by Elizabeth M. Markham from the October 1993 issue of Mathematics Magazine page 242 (doi.org/10.2307/2690738).

#mathshorts​ #mathvideo​ #math​ #calculus #mtbos​ #manim​ #animation​ #theorem​ #pww​ #proofwithoutwords​ #visualproof​ #proof​ #iteachmath #geometricsums #series #infinitesums #infiniteseries #geometric #geometricseries #square

To learn more about animating with manim, check out:
manim.community/
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Views : 19,367
Genre: Education
License: Standard YouTube License
Uploaded At Aug 8, 2024 ^^


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RYD date created : 2024-08-28T23:23:30.482174Z
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65 Comments

Top Comments of this video!! :3

@UserYouTube506

3 months ago

Math in school: 🥱
Math in internet:

76 |

@anujthakur3016

1 month ago

This is basically geometric progression in which the common multiple r has value less than 1 so show the formula to get sum of infinity a/(1-r) can be used ,its the same thing. Btw a is the first term in the above formula

2 |

@pieceofwaterofficial330

1 month ago

1. Let 0.(n)=x
2. Multiply both sides by 10
n.(n)=10x
3. Substract x from both sides
n.(n)-0.(n)=10x-x
n=9x
x=n/9
4. Recall 0.(n)=x
0.(n)=n/9

1 |

@aireyroblox

3 months ago

So basically for any n, 0.nnn repeating will be equal to 1 in base n+1

22 |

@horriblememes

3 months ago

I mean yeah you can do this with any fraction

37 |

@husnuozel9031

3 months ago

Beautiful ❤️

3 |

@FaerieDragonZook

3 months ago

The areas may be equal in measure, but there is a point in the center of the square that is never shaded. One way you can think of this is that the limiting difference between 0.888..._9 and 1.0 is an infinitesimal.

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@Azuro123-pj7xj

3 months ago

Isn't x-1 over x + x-1 over x² + x-1 over x³ ... always 1?

14 |

3 months ago

0.nnnnnn is 1 in base n+1

10 |

@J3ff_K1ng

2 months ago

I've just realised that this videos of proving that something is 1 in base X is not as impressive since it's just like 0.999... is 1 in base 10 lol

1 |

@purple_m0rse

3 months ago

0.99...=1 in base 10

3 |

@mitsunam7001

3 months ago

How many series are left with these proofs?

2 |

@brianhale2977

3 months ago

Or we can be perfectly happy knowing that the area of the square is one square and go about the rest of our days without obsessing over tic tac toe boards. 😅

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@FelanLP

2 months ago

Good example how 0.99999... is equal to 1 (in base 10).

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@FPSDECEM

3 months ago

8/9=0,(8)≠1

1 |

@scottabroughton

3 months ago

You could also do 0.eee = 1 in hexadecimal.

8 |

@BennoRob95

3 months ago

Asymptoticism should be a word because this would be Antiasymtoticism

|

@codatheseus5060

3 months ago

0.0000000... = 1 in base 1

3 |

@jasonhilliker492

3 months ago

Wouldn't it be more accurate to say it approaches 1 instead of equals 1?

1 |

@MobarakHossen-v7o

1 month ago

(0.88888...)9=1

1 |

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