Maarten van Dijk's Avatar

Maarten van Dijk

@maavdijk.bsky.social

Mathematics master student at Utrecht University, 25 years old

163 Followers  |  208 Following  |  136 Posts  |  Joined: 07.11.2024  |  2.4178

Latest posts by maavdijk.bsky.social on Bluesky

Many congrats! Hope this is just the beginning for your journey

25.10.2025 14:42 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

What I appreciate the most about math research is that the only thing you need to care about is the math itself. No need to worry about not enough people responding to your survey, the risk of blowing up a lab, acquiring rare/expensive materials/equipment etc. Just math.
#MathSky

06.10.2025 13:56 β€” πŸ‘ 3    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0

Yeah same... I don't want to hear how damn stressed I am, I already know

04.10.2025 10:02 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Many many congratulations! Hope that you get more opportunities in the near future

16.09.2025 06:26 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

I'm about to publish my first coauthored paper soon. I only contributed 3-4 pages out of ~20, but it still feels surreal. Just a year ago I didn't think any mathematician would've seen something in me to give me this opportunity, especially considering my undergrad grades.
(1/4)

14.09.2025 21:09 β€” πŸ‘ 10    πŸ” 1    πŸ’¬ 5    πŸ“Œ 0

Congrats!!

08.09.2025 11:35 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Love the "draw graph" section of House of Graphs. Just draw your graph and download it in Tikz

06.09.2025 12:51 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
r4rk1/1bpp2pp/1p2pnq1/8/2P5/P3PN1n/1B2BPPK/R2Q1R2 b - - 1 17

r4rk1/1bpp2pp/1p2pnq1/8/2P5/P3PN1n/1B2BPPK/R2Q1R2 b - - 1 17

I had 38 seconds on the clock when I got to this position in a bullet game. Can you find the forced checkmate within this time? (I didn't - chat, am I cooked?)

#chesspunks

30.08.2025 15:59 β€” πŸ‘ 0    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0

Was in Korea couple years ago and was right in the heatwave there similar temperatures to that. I survived but damn it is not nice

30.08.2025 15:32 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
Comultiplication in \mathbb{C}[x] is given by
\Delta(x^n) = \sum_{i=1}^{n} x^i \otimes x^{n-i}
which is what I don't get - this formula seems pulled out of a hat to me.

Comultiplication in \mathbb{C}[x] is given by \Delta(x^n) = \sum_{i=1}^{n} x^i \otimes x^{n-i} which is what I don't get - this formula seems pulled out of a hat to me.

I don't understand the intuition behind comultiplication in (co/bi)algebras. Yes I'm aware that it's the dual of multiplication, but categorical duality means nothing to me in terms of intuition. Is there a better explanation of how to find an expression for Ξ”(x) given ΞΌ?
#mathsky

11.08.2025 16:44 β€” πŸ‘ 2    πŸ” 2    πŸ’¬ 1    πŸ“Œ 0

Why is so little known about the representation theory of the symmetric group over positive-characteristic fields?
#mathsky

05.08.2025 09:12 β€” πŸ‘ 1    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0

Society needs to learn how to deal with this. Helping out others is great, them interpreting it differently is less great but after clarification should be forgiven. If after clarification they still are mad then they need to grow up

04.08.2025 14:42 β€” πŸ‘ 1    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0
Illustration. A self portrait done in procreate on deep warm pink paper. I’m sitting in a field surrounded by weeds and wildflowers holding zinnias. My skin is bright green. Some stylized 60s butterflies frame me, they have minty green colored stars. Above is a very deep blue night sky full of yellow stars, it says acid lich in a green 60s style hand lettering and there are pink clouds in the sky. It’s framed by stripes of the colors used in the piece, brown, orange, pink, yellow, green, bright blue and lavender.

Illustration. A self portrait done in procreate on deep warm pink paper. I’m sitting in a field surrounded by weeds and wildflowers holding zinnias. My skin is bright green. Some stylized 60s butterflies frame me, they have minty green colored stars. Above is a very deep blue night sky full of yellow stars, it says acid lich in a green 60s style hand lettering and there are pink clouds in the sky. It’s framed by stripes of the colors used in the piece, brown, orange, pink, yellow, green, bright blue and lavender.

πŸŒ»πŸ¦‹πŸŒ»

01.08.2025 04:33 β€” πŸ‘ 137    πŸ” 53    πŸ’¬ 8    πŸ“Œ 1

Ohhh nice. Good luck!

31.07.2025 18:46 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Preview
a penguin with a bag of ice on its head and a thermometer in its beak says " get well soon " Alt: a penguin with a bag of ice on its head and a thermometer in its beak says " get well soon "
30.07.2025 20:09 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Post image Post image Post image Post image

This trend has been going viral on tw*tter so I'll cross-post my entry here as well.

Four math books that had a big influence on my mathematical thinking. Your turn.

#MathSky #AlgComb

30.07.2025 08:50 β€” πŸ‘ 4    πŸ” 2    πŸ’¬ 2    πŸ“Œ 0

Newton and Hilbert aged backwards I guess and Galois survived his battle!

27.07.2025 10:01 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

If you don't mind me asking, what conjectures are you looking at?

26.07.2025 19:09 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

I'm sorry for your loss

25.07.2025 16:08 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

What if your group consists only of mathematicians?

22.07.2025 11:56 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Enjoy your stay here in the Netherlands! Or rather: veel plezier hier!

13.07.2025 09:48 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Selfie game gets better πŸ˜ƒ

12.07.2025 21:20 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Symmetric function theorists:
Since the plethystic substitution & evaluation maps don't commute in general due to an extra factor of (-1)^n involved when evaluating the plethysm of a negation (a problem when n is odd), would a characteristic 2 setting solve this problem?
#MathSky #AlgComb

09.07.2025 19:17 β€” πŸ‘ 1    πŸ” 2    πŸ’¬ 0    πŸ“Œ 0

Congrats!

09.07.2025 17:34 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

So in browser you click on your profile pic and the one of the settings is language. If you have an iPhone then you need to go to your iPhone settings then go to the Youtube settings there and set the default language to English. Other phone idk haha. This will only affect Youtube not entire account

06.07.2025 18:20 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

I think one of the solutions is to set your language to English (either UK or US). Maybe other languages will become bad translations in English but at least you won't have terrible translations of video titles from English to whatever language you have set (I guess Dutch)

06.07.2025 16:27 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

ik bluesky isn't the best place for this but I really wanna find this earworm. All I know is that it's probably mando/canto/J-pop, in Bβ™­ major, and notoriously repeats the chord progression
Ia-Vb-via-Ic-IVa-Ib-ii7a-Va
with these exact inversions throughout the whole song. Ideas?

06.07.2025 13:06 β€” πŸ‘ 0    πŸ” 1    πŸ’¬ 1    πŸ“Œ 0

πŸŽ‰

04.07.2025 06:24 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Awhhh man. I'm sorry that you are in this total shit situation

03.07.2025 16:21 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

But I want her!

27.06.2025 17:50 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

@maavdijk is following 20 prominent accounts