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Amar Hadzihasanovic

@amarh

Assistant Professor at TalTech, advisor at Quantinuum. Mathematician & CS theorist. Born in ex-YU, raised in ๐Ÿ‡ฎ๐Ÿ‡น, lived in ๐Ÿ‡ณ๐Ÿ‡ฑ๐Ÿ‡ฌ๐Ÿ‡ง๐Ÿ‡ฏ๐Ÿ‡ต๐Ÿ‡ซ๐Ÿ‡ท, now in ๐Ÿ‡ช๐Ÿ‡ช.

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13.11.2024
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Latest posts by Amar Hadzihasanovic @amarh

Lol I meant "sorry world" not "sorry you" but fair point

06.03.2026 13:52 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Everything I've read from Wolchover has been excellent and find it hard to believe it would be due to carelessness, hopefully it was just time constraints + people not replying or not wanting to be named! Sorry it happened in an article involving me :(

06.03.2026 13:48 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

I know for a fact the journalist spoke to one woman in ACT before me, and I made a point during our conversation of *only* referring her to other women in ACT. I don't know why none are mentioned in the column. I reject that this reflects the culture of the field.

06.03.2026 12:50 ๐Ÿ‘ 9 ๐Ÿ” 1 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Distilled water + the strongest spirit available in the region would be better than nothing while we figure out the rest

30.08.2025 13:44 ๐Ÿ‘ 4 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Could say I learnt this in Prester John's kingdom where they all do it

30.08.2025 13:21 ๐Ÿ‘ 3 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Not so sure about proving germ theory but maybe I could convince a bunch of doctors&obstetricians to wash their hands and see their success rate improve

30.08.2025 13:18 ๐Ÿ‘ 4 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

(Also because of the nature of that exterior shotโ€”flying through the window etcโ€”I experienced a momentary "Lumiรจre locomotive" moment, like, "damn, they're outside here")

22.07.2025 20:53 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

It was very surreal for me to watch because not only the Boravians speak my language, but the one exterior scene in Boravia is Tallinn, a few hundred metres from the cinema where I was watching the film

22.07.2025 20:48 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 2 ๐Ÿ“Œ 0

Boravia is very slavic-coded (they actually speak serbian and the president is played very clearlyโ€”to meโ€”as a serbian nationalist, although that may be an actor's injection), but that's probably just to complicate the Israel-coding it by making "also" a Russia/Serbia stand-in

22.07.2025 20:36 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
I am looking for a PhD student to work with me on a project at the intersection of type theory, combinatorial topology, higher category theory, rewriting theory.
Starting date is asap; you need to have a Master's degree by the start of your PhD. The expected PhD study time at TalTech is 4 years. A PhD is a salaried position and is topped with an additional tax-free stipend from the department.
There is a vibrant community of category theorists, type theorists, and theoretical computer scientists at TalTech.
The PhD candidate would join the Compositionality group led by Pawel Sobocinski. We also work with the Logic and Semantics group led by Tarmo Uustalu.
Tallinn is a beautiful city on the Baltic coast. The TalTech campus is interspersed with forested areas, which cover a large part of the country. Estonia has generous parental leave, a great education system, and legal same-sex marriage.
Send a CV and an expression of interest to amar.hadzihasanovic@taltech.ee if you are interested.

I am looking for a PhD student to work with me on a project at the intersection of type theory, combinatorial topology, higher category theory, rewriting theory. Starting date is asap; you need to have a Master's degree by the start of your PhD. The expected PhD study time at TalTech is 4 years. A PhD is a salaried position and is topped with an additional tax-free stipend from the department. There is a vibrant community of category theorists, type theorists, and theoretical computer scientists at TalTech. The PhD candidate would join the Compositionality group led by Pawel Sobocinski. We also work with the Logic and Semantics group led by Tarmo Uustalu. Tallinn is a beautiful city on the Baltic coast. The TalTech campus is interspersed with forested areas, which cover a large part of the country. Estonia has generous parental leave, a great education system, and legal same-sex marriage. Send a CV and an expression of interest to amar.hadzihasanovic@taltech.ee if you are interested.

I am looking for a PhD student to join us in Tallinn!
#MathSky

07.07.2025 08:45 ๐Ÿ‘ 3 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

My student's first solo paper! (And fourth overall in the space of a year๐Ÿคฉ)

05.05.2025 08:22 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Enrico Vitale presenting a slide on torsion and torsion-free abelian groups

Enrico Vitale presenting a slide on torsion and torsion-free abelian groups

Marco Abbadini presenting a slide on problems of compact metric spaces

Marco Abbadini presenting a slide on problems of compact metric spaces

Georg Lehner presenting a "motivation" slide

Georg Lehner presenting a "motivation" slide

The 110th PSSL (Peripatetic Seminar on Sheaves and Logic) has started in Tallinn, the first ever to take place in Estonia!
#MathSky

03.05.2025 07:36 ๐Ÿ‘ 5 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

I think the blueprint for these is a bully asking "why are you hitting yourself?", the "lie" that the victim is hitting themselves is not even supposed to be believed by anyone

30.04.2025 14:16 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Top part of the front page of a book draft.

Title: Combinatorics of higher-categorical diagrams
Author: Amar Hadzihasanovic - Tallinn University of Technology

First part of abstract: This is a book on higher-categorical diagrams, including pasting diagrams. It aims to provide a thorough and modern reference on the subject, collecting, revisiting, and expanding results scattered across the literature, informed by recent advances and practical experience with higher-dimensional diagram rewriting.

Top part of the front page of a book draft. Title: Combinatorics of higher-categorical diagrams Author: Amar Hadzihasanovic - Tallinn University of Technology First part of abstract: This is a book on higher-categorical diagrams, including pasting diagrams. It aims to provide a thorough and modern reference on the subject, collecting, revisiting, and expanding results scattered across the literature, informed by recent advances and practical experience with higher-dimensional diagram rewriting.

Just signed a contract with CUP for my higher-categorical diagrams book ๐Ÿ˜Š

30.04.2025 12:46 ๐Ÿ‘ 4 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
Preview
โ€˜It makes me want to screamโ€™: Nobel peace prize winner horrified by planned exits from landmine treaty Plans by five Nato countries to pull out of life-saving agreement are โ€˜stupidโ€™, says Nobel laureate Jody Williams

It may start with #landmines, but the bigger threat lies in the erosion of the laws of war.

Hear from Jody Williams, on why the recent threat of withdrawals by some European nations from the Mine Ban Treaty endangers global norms and civilian lives.

#ProtectMineBan

29.04.2025 09:53 ๐Ÿ‘ 4 ๐Ÿ” 3 ๐Ÿ’ฌ 2 ๐Ÿ“Œ 0

There's a comforting narrative about war crimes where it's bad people making decisions at the top, army follows orders, even when soldiers commit horrible crimes they themselves come back traumatised. SA breaks that because it implies some active revelling in the crimes, so complicity at all levels

29.04.2025 07:27 ๐Ÿ‘ 23 ๐Ÿ” 2 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

I think sth makes people uncomfortable about SA being a "standard" thing that imperial armies & police do, like outside of fiction I've noticed that even people who think the Iraq invasion was a terrible war crime may wince at the idea SA from US&British troops would've been "condoned" at the top

29.04.2025 07:21 ๐Ÿ‘ 19 ๐Ÿ” 2 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Is it just what people expect? Is it because baths are the upper-class method of washing, and showers are meant to be a quick rinse for the masses?

23.04.2025 21:38 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Either the pressure is terrible, or it's in a weird corner, or it doesn't drain properly, or it has random bursts of scalding hot water, etc

23.04.2025 21:31 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

I don't think I've ever had a good shower in England. Every shower in the country seems to be broken or annoying in its own way. I don't know what it is. Every other country I've been to seems to have figured showers out.

23.04.2025 21:29 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

I suspect for conferences, sometimes, it's to resolve clusters of consonants in the acronym, like how OOPSLA (fun) without "and applications" is OOPSL (unreadable)

19.04.2025 16:58 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

I want to say this again, and clearly.

I spoke to three KCs, and we were formally advised by two, at Premier League sets who said FWS's case was clearly wrong, and one said not even arguable. 1/2

18.04.2025 15:25 ๐Ÿ‘ 420 ๐Ÿ” 101 ๐Ÿ’ฌ 21 ๐Ÿ“Œ 5

It feeds into what is the patriarchy's best and most successful argument. Any so-called "feminist" whose obsession is stranger danger and single-sex spaces is the patriarchy's best friend

18.04.2025 13:53 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Where then, by accepting the bargain, they become property of their patron who is (as well known) much more likely to be the actual danger.

This is one reason why the GC propaganda focussing on strange men in bathrooms goes hand in hand with the far right...

18.04.2025 13:53 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Something I think is often misunderstood, is that the idea that men are inherently dangerous to women is not anti-patriarchy, but in fact foundational to patriarchy... the bargain of patriarchy is: to protect them from the multitude of strange men, women need the patronage of a "trusted" man...

18.04.2025 13:53 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
Preview
Quakers condemn police raid on Westminster Meeting House Police broke into a Quaker Meeting House last night (27 March) and arrested six young people holding a meeting over concerns for the climate and Gaza.

You think the arbitrary arrest of political dissenters cannot happen in the UK? It already does. www.quaker.org.uk/news-and-eve...

29.03.2025 07:39 ๐Ÿ‘ 1813 ๐Ÿ” 954 ๐Ÿ’ฌ 124 ๐Ÿ“Œ 125
The scene from Good Will Hunting where Will taunts another guy about getting a girl's number, but he's holding a table of Betti numbers instead of a phone number

The scene from Good Will Hunting where Will taunts another guy about getting a girl's number, but he's holding a table of Betti numbers instead of a phone number

How do you like them apples?!

24.03.2025 14:32 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

If adversaries use inhumane weapons, that's all the more reasons to not use them---otherwise what's the difference?

I know what landmines have done to my native country, I hope my adoptive country won't make this shameful choice
@tsahkna.bsky.social

18.03.2025 15:29 ๐Ÿ‘ 3 ๐Ÿ” 4 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Higher Topos Theory is the Infinite Jest of mathematics

16.03.2025 16:15 ๐Ÿ‘ 2 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

"Chu spaces over a set" would come the closest to this pattern, I think?

25.02.2025 19:51 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0