video thumbnail 53:50
The power tower puzzle | Lockdown math ep. 8

2020-05-12

[public] 459K views, 18.4K likes, 147 dislikes audio only

channel thumb3Blue1Brown

A fun puzzle stemming from repeated exponentiation.

Full playlist: https://www.youtube.com/playlist?list=PLZHQObOWTQDP5CVelJJ1bNDouqrAhVPev

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Brought to you by you: https://3b1b.co/ldm-thanks

Notes by Ngân Vũ:

https://twitter.com/ThuyNganVu/status/1261014161464516608?s=20

Play along on Desmos:

https://www.desmos.com/calculator/nul32eaaa9

Related videos.

Calculus series:

https://www.youtube.com/playlist?list=PLZHQObOWTQDMsr9K-rj53DwVRMYO3t5Yr

In particular look at:

/youtube/video/CfW845LNObM

Numberphile on Grahm's constant:

/youtube/video/XTeJ64KD5cg

Thanks to these viewers for their contributions to translations

Hebrew: Omer Tuchfeld

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Video timeline (thanks to user "noonesperfect")

0:36 Question 1

1:13 Answer 1

1:29 Introduction to tetration

3:37 How exponentiation works in tetration

6:10 Python program for power tower iterations

8:40 Question 2

9:32 Python Program regarding question 2

10:37 Answer 2 and explanation

13:18 Power tower for infinite size converges or not? (Thumbnail question)

15:21 Question 3

16:28 Footage of Grant's setup arrangement problem due to construction-work back at home.

16:49 Answer 3 and explanation

17:40 Checking logic behind 2 different problems of power towers whose answer converges to the same value (Is it even possible?)

19:42 Checking same logic using Desmos graph tool i.e. Cobweb Graph (Desmos graph link in description)

28:12 Question 4

28:51 Questions from audience tweets

29:15 Knuth's Up Arrow Notation and Graham's Number (Check Numberphile video in description)

32:32 Answer 4 and explanation

37:29 Homework/Challenge Puzzle

39:20 Thumbnail question power tower logic

40:55 Audience questions from twitter

41:45 Power tower for complex numbers/Fractal set

45:19 Brainteaser

48:06 More questions from tweets

53:17 Notes for lock-down series in Grant's Tweeter

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Question 1
/youtube/video/elQVZLLiod4?t=36
Answer 1
/youtube/video/elQVZLLiod4?t=73
Introduction to tetration
/youtube/video/elQVZLLiod4?t=89
How exponentiation works in tetration
/youtube/video/elQVZLLiod4?t=217
Python program for power tower iterations
/youtube/video/elQVZLLiod4?t=370
Question 2
/youtube/video/elQVZLLiod4?t=520
Python Program regarding question 2
/youtube/video/elQVZLLiod4?t=572
Answer 2 and explanation
/youtube/video/elQVZLLiod4?t=637
Power tower for infinite size converges or not? (Thumbnail question)
/youtube/video/elQVZLLiod4?t=798
Question 3
/youtube/video/elQVZLLiod4?t=921
Footage of Grant's setup arrangement problem due to construction-work back at home.
/youtube/video/elQVZLLiod4?t=988
Answer 3 and explanation
/youtube/video/elQVZLLiod4?t=1009
Checking logic behind 2 different problems of power towers whose answer converges to the same value (Is it even possible?)
/youtube/video/elQVZLLiod4?t=1060
Checking same logic using Desmos graph tool i.e. Cobweb Graph (Desmos graph link in description)
/youtube/video/elQVZLLiod4?t=1182
Question 4
/youtube/video/elQVZLLiod4?t=1692
Questions from audience tweets
/youtube/video/elQVZLLiod4?t=1731
Knuth's Up Arrow Notation and Graham's Number (Check Numberphile video in description)
/youtube/video/elQVZLLiod4?t=1755
Answer 4 and explanation
/youtube/video/elQVZLLiod4?t=1952
Homework/Challenge Puzzle
/youtube/video/elQVZLLiod4?t=2249
Thumbnail question power tower logic
/youtube/video/elQVZLLiod4?t=2360
Audience questions from twitter
/youtube/video/elQVZLLiod4?t=2455
Power tower for complex numbers/Fractal set
/youtube/video/elQVZLLiod4?t=2505
Brainteaser
/youtube/video/elQVZLLiod4?t=2719
More questions from tweets
/youtube/video/elQVZLLiod4?t=2886
Notes for lock-down series in Grant's Tweeter
/youtube/video/elQVZLLiod4?t=3197