INTERNATIONAL MATH OLYMPIAD 2023 | Problem 5

In this video, we present a solution to IMO 2023/5.
00:00 Problem Statement
01:05 Motivation (1st part)
04:54 Upper bound
07:19 Motivation (2nd part)
10:54 Lower bound
Check out our website www.calimath.org to find past problems, solutions and other cool stuff.
Solution PDF: calimath.org/pdf/IMO2023-5.pdf
branch: combinatorics
difficulty: 10
Our website: www.calimath.org
Contact us: [e-mail]

[@calimath6701]

I made a technical error at 14:25. k >= p(c) is not necessarily true. However, the fact that we always find a circle c such that r(p(c)) >= log(n+1) tells us that k >= log(n+1).

[@aLittlePal]

so glad you guys are jump scaring the sleepy bad bad naughty students with a stunning explosion special effect

[@brockobama257]

a mexican triangle has 1 cartel member in each row

[@SCBA-if4wl]

I'd love an intro to prob. theory from your channel!

[@samuelnuyts2035]

Really nice video! It’s great to have slightly longer videos like here, where more motivation is given as if its just a straight solution its hard to see where everything is coming from. (I think you meant IMO 2023/5 in the description :D)

[@calimath6701]

Hey, thanks for the feedback. Since I am currently trying to develop my motivation-presentation-game, it is really nice to hear that you enjoyed it in this video :). (You were right about the description ^^)