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gunnihinn

436 karma · joined March 2, 2016

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gunnihinn··on We Will Not Be Divided
The bravery of the people signing this anonymously is inspiring.
gunnihinn··on We're no longer attracting top talent: the brain drain killing American science
> Terrence Tao was a good example of what happens when an exceptionally smart person stops getting funded by an American University: not moving to another country, but got VC money and created a new company.

What company did Tao fund with VC money?

gunnihinn··on The Unix-Haters Handbook (1994) [pdf]
Thanks, I hate it.
gunnihinn··on Anyone can push updates to the doge.gov website
Their boss does nazi salutes at political events. They’re nazis.
gunnihinn··on Software Engineer Pay Heatmap for Europe
I think the Icelandic data is a bit skewed upwards. It’s showing senior and principal level salaries in large companies, most “normal” devs earn maybe 70% of that.
gunnihinn··on Show HN: Stretch My Time Off – An Algorithm to Optimize Your Vacation Days
That's pretty cool. Unfortunately school holidays mean I can't take time off whenever, but I can definitely use the idea to plan time off around those.
gunnihinn··on Axiomatics: Mathematical thought and high modernism
A distribution is not a function. It is a continuous linear functional on a space of functions.

Functions define distributions, but not all distributions are defined that way, like the Dirac delta or integration over a subset.

gunnihinn··on Calculating the norm of a complex number
For any smooth function (like the conjugate) it makes sense to ask whether there exist holomorphic functions that approximate it arbitrarily well.

However: Suppose that for every n > 0 there exists a holomorphic function f_n such that |f_n(z) - z| < 1/n for all z. Then |f_n(z)| <= |f_n(z) - z| + |z*| = |z| + 1/n by the triangle inequality. A consequence of Liouville's theorem is that any entire holomorphic function with polynomial growth is a polynomial; here in particular we would need to have f_n(z) = a_n z + b_n for some complex numbers a_n and b_n. For real x we would have |(a_n - 1)x + b_n| < 1/n for all x, so a_n = 1. For imaginary iy we would have |(a_n + 1)iy + b_n| < 1/n for all y, so a_n = -1, which is a contradiction.

In fact, if a sequence of holomorphic functions converges uniformely on compact sets, the limit is itself holomorphic because of Cauchy's theorem.

gunnihinn··on Vikings in al-Andalus and the Maghreb
Good for you to stick up for the _checks notes_ nazis.
gunnihinn··on Men on Viagra may reduce their Alzheimer's risk – study
I read Playboy for the stories and take Viagra for the memories.
gunnihinn··on Relearning math as an adult
> I may be biased as I am a trained Mathematician, but I always feel when someone says "Math is Hard", that is because they had bad teachers.

I dunno, man. I have a PhD in complex differential geometry and think math is pretty hard.

gunnihinn··on Grindavik [video]
Thank RÚV, the Icelandic national broadcaster, which setup cameras weeks ago and has been live streaming the area since then for capturing the eruption.
gunnihinn··on About math limitations
> they are objects (I call them oracles) that answer Yes or No when asked if the number ought to be between two given rational numbers.

So a real number is a function from pairs of rationals to a two-element set (plus some sanity conditions)? Why is that better than the other constructions?

gunnihinn··on A trick to eliminate 2π (sometimes)
This notation maybe makes some things in trigonometry or Fourier analysis easier to do. Then a wild polynomial appears and all of the sudden we have to write

(d bar) x = 1 / 2 pi.

gunnihinn··on Macroeconomic changes have made it impossible for me to want to pay you
Honestly every single one of those execs is very replaceable too.
gunnihinn··on Ask HN: Has anyone fully attempted Bret Victor's vision?
> Bret Victor is very much Alan Kay's protege and has unfortunately inherited the curse of people cherry-picking particular ideas and missing the bigger picture.

Maybe it's time we lay some of the blame for us idiots just not getting Alan Kay's ideas on Alan Kay. At this point he only has himself to blame if he's spent 50 years trying and failing to communicate his wonderful ideas.

gunnihinn··on Formalising a new proof that the square root of two is irrational
As the post points out this involves some claims about infinite sets that are maybe not super obvious to laypeople (every infinite set of natural numbers has a least element). But we can rephrase this to avoid mentioning sets:

For any rational number p/q (with q > 0) there exists a smallest positive natural number k such that k * p/q is natural: Clearly q works, so we check the finitely many numbers 1, ..., q and pick the smallest.

Suppose the square root of 2 is rational. Let k be this smallest number for \sqrt 2, and proceed with the rest of the proof to find 0 < k' < k that also works.

gunnihinn··on Source code for Dutch DigiD app released under Dutch Open Government Act
Iceland does the same: https://github.com/island-is/island.is
gunnihinn··on Helix: A Neovim inspired editor, written in Rust
I grew up with the Icelandic layout. When I started programming professionally I taught myself the en-us layout and stared using that instead. It is much easier on my hands and fingers; it really does show that the people who came up with the syntax for most of the programming languages in use picked things that were easy to type on a US layout and didn't give any thought to the rest of us.
gunnihinn··on Knuth changes his mind on Bernoulli number B_1
There you go, arguing a trivial point at length instead of doing interesting math. This is why tau is not worth anyone’s time. There’s no one weird trick to understanding math.
gunnihinn··on Knuth changes his mind on Bernoulli number B_1
I’m a mathematician. Tau is bikeshedding. It’s far removed from being either interesting or useful. But it is a useful litmus test for whether a person’s options on math are worth listening to or not.
gunnihinn··on How to Design Programs
> SQLite does not compete with client/server databases. SQLite competes with fopen().

https://www.sqlite.org/whentouse.html

gunnihinn··on Bits of advice I wish I had known
> 103 Bits of Advice I Wish I Had Known

Not one of them being "edit your writing".

gunnihinn··on American spy hacked Booking.com, company stayed silent
I work at Booking. We do not do this and never have. Other OTAs do, like Expedia. It’s the merchant vs. agent model.
gunnihinn··on Ticketmaster will pay $10M for hacking rival ticket seller
This is America. Schwarz was not prosecuted for his crimes but for his failure to monetize them.
gunnihinn··on The Rome Toolchain: A linter, compiler, bundler, and more
There are very old reports saying the Rome build times are quite long, longer than a day even. Has this changed?
gunnihinn··on Knuth versus Email (1999)
Calm down, Bret Stephens.
gunnihinn··on Google to Slow Hiring for Rest of 2020
Maybe the travel, restaurant etc industries have stopped paying for clicks so Google gets less cash? My work cut down on PPC by a lot and we spent a lot of money on it.
gunnihinn··on Broot – A new way to see and navigate directory trees
F
gunnihinn··on Americans are retiring to Vietnam
Turns out the Vietnam war was a savvy retirement plan setup: clear out some space, return to the US to bask in the most generous ROI in history for 30+ years, return to that patch of land that’s conveniently clear now.

At least the conquistadors had to live there in the interim years.

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