Rogier Brussee

Mathematician, Singer.
Works at JADS den Bosch.

[Rogier Brussee @RogierBrussee]

@pascalkwanten Sidenote:
G=(SU(3)×SU(2)×U(1))/ℤ₆ = S(U(3) × U(2)),
the stabiliser of a plane in C^5 under the action of SU(5).

[Rogier Brussee @RogierBrussee]

@PlanetOfMemes Dinos. They took away the dinos!

[Rogier Brussee @RogierBrussee]

@redangel2009 According to my mother: as a young (~4 years old) boy I saw her making Brussels sprouts and absolutely loved them, saying they were so cute, as if made for children, and couldn't wait to eat them. Then I tasted them, made a face like in the picture and spat them out.

[Rutger Bregman @rcbregman]

Here's the mustread if you want to understand this insanity, by investigative journalist Jesse Frederik (in Dutch): https://t.co/0NMK18zfQ2.

Short summary:

1. Drilling for gas caused (by international standards) minor earthquakes. The damage to some houses in the epicentre area was real. And the state and the gas company handled it badly. Corporate lawyers, denial, etc.

2. Things became super political. The need to establish cause was removed. You can now claim mining damage anywhere the ground has ever moved more than 0.55 mm per second. That's a basketball bouncing on a floor. (For most of the province it was a single tremor back in 2012).

3. Then the investigating stopped too. 'Victims' first got €5,000. Then €10,000. Then up to €60,000 of repairs with no investigation into what caused them.

4. Claims exploded. 2024 was the mildest seismic year in two decades, but there were 42,790 damage claims. Over 70% of claims now come from zip codes where the strongest ground motion was about what a truck going over a speed bump produces.

5. Total compensation: €3.9 billion. 56% of all addresses in the 'earthquake zone' have been compensated at least once (including a rich town where the strongest tremor expected was equivalent to a passing train), and where an engineer puts the odds of a quake-caused crack in an undamaged brick wall at 1 in 20,000. The town has collected €65 million, plus another €14.5 million in green-energy subsidies for earthquake 'victims'.

6. Meanwhile the gas company spent €200 MILLION on research - Groningen became the global centre of seismological research (even though people in - for example - Italy would find it funny that we call these tremors 'earthquakes'). The whole provinces was wired with sensors.

7. All the research was ignored though. The political debate was dominated by a form of science denial, but this time mainly coming from the left. One international expert called the parliamentary inquiry's account of the physics 'misinformation on a very serious scale'.

8. The gas field is now being filled with cement. Around 550 billion cubic metres is still down there (roughly 18 years of Dutch consumption), but the Netherlands now imports most of what it burns. Experts asked to keep some wells intact as an emergency reserve. Parliament said no.

9. End result: we spent insane amounts of money, are much more dependent on foreign autocrats for our energy (with higher greenhouse gas emissions), misinformation is everywhere, and citizens in Groningen are still angry.

[Rogier Brussee @RogierBrussee]

Waanzinnig goed concert "In evening light" met muziek van Peteris Vasks (die aanwezig was!) in de Plechelmus in Oldenzaal in het kader van #Stiftfestival. Prachtige muziek, fantastische musici.

[Rogier Brussee @RogierBrussee]

@misterking1 @BM_Visser @maartenbakkerch fijnstof uitstoot bronnen Elektrische vs. Brandstofauto (Benzine/Diesel)

Uitlaat: Geen uitstoot (geen roet en gassen)
Remmen: Minder slijtage (remt op motor)
Banden: Iets meer slijtage (hoger gewicht door zware accu)
Totale fijnstof: circa 20% tot 40% minder.
(bron Gemini)

[Afshine Emrani MD FACC @afshineemrani]

1/ I'm a cardiologist. I've practiced for twenty-five years, through a lot of "breakthroughs" that turned out to be press releases. So understand the weight of what I'm about to say: I have never seen a single week in medicine like the one we just lived through.
In the span of a few days, four separate scientific breakthroughs landed. The stock market treated them as four unrelated stories and sent a handful of biotech companies soaring. But that's the shallow read. Look closer and they are not four stories at all. They are four faces of the same story — the biggest shift in medicine since the discovery of antibiotics.

Medicine is becoming programmable. Individualized. Written for one human being instead of the average of millions.

Let me walk you through exactly what happened, in plain language, and show you where this is actually headed. Because the future arrived quietly this week, and most people scrolled right past it.

[Sulkhan Metreveli @Sulkhan]

How Russian propaganda works abroad, in one sentence per layer:

For the right: "Russia defends tradition." For the left: "NATO caused this." For the pacifist: "Weapons prolong war." For the cynic: "Everyone lies equally." For the tired: "It's complicated."

Five contradictory messages, one output: do nothing.

Russian propaganda doesn't need you to love Moscow. It needs you paralyzed — and it has a script for whichever ideology you brought to the table.

Whenever a take ends in "therefore, inaction," check the return address.

[Rogier Brussee @RogierBrussee]

@Gingerneer2 Nou ja nog twee te gaan.

[Rogier Brussee @RogierBrussee]

@Gingerneer2 Kaboom!!

[Isa Yusibov 🇪🇺 🇳🇱 🇺🇦 @Isa_Yusibov]

True solidarity is rarely loud. It lives in the quiet decision to pack a vehicle, drive toward uncertainty, and show up for strangers until they become family.

Yesterday, the world lost one of those rare souls. Andries, @Justadutchguy, a Dutch activist who, since 2022, chose to answer Ukraine’s darkest hours not with passive sympathy, but with tireless, voluntary action.

To volunteer continuously for years under the shadow of Putin's fascist war requires a profound kind of courage. It offers no glory, no titles, and no promises of safety. It asks only for endurance. In frontline towns, temporary shelters, and makeshift distribution hubs, his work was a living declaration that empathy is not just a sentiment: it is a verb.

He gave the people of Ukraine something even more valuable than material aid: the unwavering knowledge that they were not forgotten.

A life spent in service to others leaves behind an indelible mark on the world.

Therefore Andries' legacy will always be a powerful reminder that while we cannot single-handedly end the world's pain, we possess the power to step into the cold and stand beside those who suffer.

The hands that offered help may now be at rest, but the light they carried forward will continue to burn bright in the hearts of everyone they touched. In Ukraine and elsewhere.

Rest in peace, Andries.

[Rogier Brussee @RogierBrussee]

@TheMathFlow A Taylor series P_n of degree n in a point x0 approximates the function f to order n
f(x0 + h) - P_n(x0+ h) = R_n(h) with
limsup_{|h|>0} |R_n(h)|/|h|^n = 0 (i.e R_n(h) = o(h^n))
but this o(n) order approximation may only be accurate on an ever _smaller_ interval as n -> ∞!

[Rogier Brussee @RogierBrussee]

@TheMathFlow This animation suggests that the more terms in the Taylor series, the farther out it approximates the function. This is true for "entire analytic functions" (like cos and exp) but wrong for a general differentiable function f:
1/2

[Dan the “Shadow Tanker Bonker” @realLangerDan]

🚨Latest shipment of Alumina from Ireland to Russia just departing the Shannon Estuary

Estonian owned KIRKE of Hansa shipping is Russia bound with approx 7587 tons of Alumina

This allows Russia to, in the very least, free up alumina supply for Russia’s war needs. #Alumina22

[Rogier Brussee @RogierBrussee]

@WKCosmo but Tao's analysis is way more interesting than the actual counter example itself.

https://t.co/4Tnw7tK6NA

[Rogier Brussee @RogierBrussee]

@littmath I think most mathematicians had the experience of having a friendly discussion with people who, once they found out you are a mathematician, put up a face of bewilderment and/or mild disgust, often adding that math was their worst subject.

Highschool math left many scarred.

[Paul Rudnick @PaulRudnickNY]

"The reason the Saudis are allowed to have nuclear weapons but not the Iranians is because the Saudis always remember to bring suitcases of cash to Mar-a-Lago and bought my new baby a Maserati. Plus Ivanka calls the Saudis 'my personal ATM.' What don't you understand?"

[Caolan @CaolanReports]

Another ship just left Ireland to russia filled with raw materials and the Irish prime minister @MichealMartinTD just arrived in Kyiv. If you’re a journalist here doing an interview with him then ask him about this. His team are too afraid to speak to me.

[Rogier Brussee @RogierBrussee]

@mahdi_tcs_ The Riemann Hypothesis is deviously difficult but a formulation the informed layman can understand is
let P(n) = number of prime divisors of n
(e.g. P(9) = 2, P(12) = 3 ).
Now consider L(x) = ∑_{n <= x} (-1)^P(n)
Riemann Hypothesis: for all c> 1/2,
lim_{x->∞} |L(x)|/x^c = 0

[Rogier Brussee @RogierBrussee]

@dr_logvinovich @SuryaGanguli You have heard some fancy math and physics but you failed to understand it.