HNHacker News
TopNewBestAskShowJobs

justushamalaine

46 karma · joined February 19, 2016

submissionscomments
justushamalaine··on Engineering Memory: On learning to memorize first 100 digits of pi (2024)
I have a feeling that original commenter might have already understand where the the was supposed to be placed :D
justushamalaine··on Nvidia announces native GPU programming in Rust
I thought that cp*p is some kind of ugly cuda pointer declaration :D And being non-standard C++ syntax it wouldn’t compile.
justushamalaine··on CMS with AI, Not AI CMS: Wagtail 8.0's New API
Django + Wagtail has been a cheatcode for service development fir me. Great to see new release!
justushamalaine··on Maria Montessori
I have ended up with different understanding from Von Mises text. The point is that economics need to progress from axioms that are true.

This means that we start with axioms like humans have ideas how to improve their situation. Humans act with the goal of attaining to ideas they have. These are something that we can't or don't need to prove. With these two axioms we can start creating a complete set of reasonings that will explain market phenomena that happens in the real world.

And the reason why this is needed and is so important is that there are no constants in the realm of human action. That is the criticism of positivism in economics.

Positivist methods can help greatly with building theories in "natural sciences" as there are mechanistic actions and constants that are revealed by comparing rations. (this is the way we got to understand how atoms bind to molecules and how strong the gravity is). We haven't found similar constants in market phenomena and Von Mises thought we never will.

But we have found laws like the law of supply and demand or comparative advantage. And that we have reached with using only reasoning.

justushamalaine··on Maria Montessori
Thanks for your answer I really enjoyed it :)

I cannot treat Mises rejecting all verification. Of course this might be due to reading his works long after seeing how world has developed. This way it is easy to downplay the faults and see the things that had insight.

To take a concrete example of supply and demand. We can logically understand that raising supply cannot raise prices. Similarly increasing demand cannot lower prices. We can reach this conclusions by just starting with axioms that humans have a priori ideas how their situation can be improved and human acts with a goal to reach ideas. This is shown by Murray Rothbard in his book Man, Economy and State.

We cannot reach the same conclusion by just calculating ratios from historical data, due these being complex phenomena that have many confounding variables. We need to have a priori ideas to be able to start unconfound variables in such historical data.

I don't really get from his writing that he mistook the perfect algebra as representation of the real world. It just that to gain actionable insight with the real world you need to process with series of logical steps to the conclusion. The real point is not that can you make up a logical chain of statements. You always can add an ad hoc proposition to save a theory (and this was his outgoing criticism against the German Historic School). The point is to tease the statements and reasoning chains so that only things that are true remain. This is the way (Von Mises saw) to get the universal laws of human actions that he hold would be as universal as the laws of motion.

I don't think that RCT in modern economics are trying to answer same questions. You need a priori theories to devise the trials and then you need to use the same a priori theories to make sense of the results. The results might force you to change your a priori before devising a next trial. And for that process you need to use the reasoning that Von Mises advocated.

Most likely he wouldn't think that Development Economics is Economics proper. It doesn't mean that it shouldn't be studied, but it is a different realm from the laws of human action that he studied. He also didn't think that a good economist shouldn't understand other sciences and shouldn't take inspiration from them.

If you look how much insight and a priori knowledge and reasoning people like Kenneth Arrow or Milton Friedman had and used, I don't see the concrete gulf between them and Von Mises so large. They have major differences and had opposite views, but I feel that it is more a difference in degree not in kind. I think that economists have a bad habit of overstating their differences and downplaying how much they agree.

But I would believe that Von Mises would have rather drank hemlock like Socrates than admit faults on his views. But this is an characteristic of many great economists :D

justushamalaine··on Maria Montessori
But falsiable hypotheses she created :D All of his writing and lectures are full of situations where her a priori held ideas didn't survive the actions of real children in the classroom.

She thought that toy and play would great rewards, when she started with the first casa di bambini in Rome in 1907. She had prepared toys and doll house for the children to play with, when they did an exercise she had prepared. Contrary her hypothesis the kids were not interested in the toys, but continued to do the exercises. She removed the toys as kids didn't play with them, not because she didn't like them.

This is something that she did through out her career. When she was managing and teaching disabled kids she noticed a girl that had hard time of using scissors. She then created exercises that helped the girl to master the sub movements that lead to the dexterity that allowed her to use scissors.

The material she developed is so full of the details that you can only see if stop and observe fully. Even though she didn't ran randomized controlled trials she was able to separate many confounding variables.

My point is not to say that Montessori method is the only or even the best method of education, but Maria Montessori has been one of the greatest empiricists of our time. She was a fully trained doctor and kept up with other people's papers and studies during her lifetime. And all things were tested on the children in her schools.

"My intention was to keep in touch with the research of other, but to preserve my independence. The only thing that I considered to be essential was Wundt's maxim that “all methods of experimental psychology can be reduced to one, namely, to carefully recorded observation." -- Maria Montessori

This is also the same feeling that I get from Richard Feynman's writings. He just got it where you can develop mental models and theories and when you need to expose them to real world.

justushamalaine··on Maria Montessori
I do think conflate praxeology (the study of human action) and Von Mises's preferred methods of studying it. Von Mises didn't hold any views on economics that wouldn't be acceptable in the mainstream and didn't really have any objections on mainstream economics during his lifetime.

I do really like they way von Mises broke down the human action and it is related studies. It is different to study what person should strive for (ethics), why people strive for something (psychology) and how people can attain the goals they have chosen (economics).

The understanding that economics is not science that can and should not do value judgement is a great contribution. Scholars are free to offer they ideas about ethics, but it is a different discipline.

On this background you should look with his criticism against socialism. He doesn't say that goals of socialism are bad. He just points out that tools and processes advocated cannot achieve the stated goals. And he had fairly great concrete criticism about socialism in his 1920 book "Socialism: An Economic and Sociological Analysis". This predated the great Soviet Union and Chinese socialism experiments, which haven't proved him wrong.

Von Mises was not so advocating about creating theories that don't stand the test of real world. His aim was always to understand real world phenomenon. His rejection was about using tools that don't work with humans. Physics and chemistry are governed by constants like gravity, electromagnerical force, weak and strong nuclear forces that allow you to use advanced mathematics to study them and isolate these constants. Economics do have laws as strong as laws of motion, but you cannot find these the same way as human action is variable.

I do get same feeling about Richard Feynman. For him it seems that you needed to have a mental model first about a problem, before trying to model it with mathematics. [1]

You cannot progress without insight and you cannot have insight without interaction with real world. Theories only have value if they can affect actions in the real world. And there is a lot of ways outside of p-values how to allow that feedback from the real world to affect you. And this is something I feel that all of those people intuitively understood. :)

[1] https://thinkjarcollective.com/articles/richard-feynman-spin...

justushamalaine··on Maria Montessori
Maria Montessori is one of the few people that seemed to understand intuitively how science works. For me she is in there with likes of Ludvig Von Mises and Richard Feynman. For her there is no question how to develop things and every moment is a possibility to observe and try to understand.

Montessori's main contribution is applying scientific methods for education. She is first and foremost and empiricist that led over 50 years of field study on education. The Montessori method is just an outcome of that study.

So one thing that we should take away from her is that it is our responsibility to see and observe the kids and adjust our behavior and environment so that the kids can fulfill their potential.

"The first Right of Man, the Fundamental Right, should recognise the right of the child to be helped to overcome those obstacles which may hinder, repress or deflect his constructive energies thereby denying him the certainty of becoming an efficient, well-balanced adult." - Maria Montessori

justushamalaine··on Pinterest commits to spending $3B with AWS through to 2029
But you couldn't, could you? 400 million is more than Hetzner total revenue.

I think 400 million is staggering amount of money to be used for computing, but if you are using that amount of money there are only handful amount of players that can absorb that kind of money and provide you services.

justushamalaine··on Vitalik escalates ETH 2.0 merge as miners plan a 51% attack
Well cards against humanity did that and the hole was worth over 100k!

https://www.theguardian.com/technology/2016/nov/28/cards-aga...

justushamalaine··on How you can go wrong with Git
There is this fun way of not nuking others changes in the remote `git push --force-with-lease`.

This pushes your commits if you already know all commits that are in the branch in the remote. Of course this still leaves the problem that others will have merge conflicts when they pull from the remote.

Rebasing is powerful tool and it really provides great benefits.

Especially before your merge your branch to master. It is lot cleaner if someone cleans the branch history so that commits are combined to clean nice commits, before it is merged to master.

Personally I am annoyed about `fix typo in last commit` commits merged to master.

justushamalaine··on Ask HN: What three books impacted your career the most?
Thinking Fast and Slow, Daniel Kahneman

How I raised myself from failure to success in selling, Frank Bettger

Thinking in Systems: A Primer, Daniela Meadows

Most important thing is to get up and start doing stuff, understand how you personally f$$k things up and reap benifits of compound interest in personal development. I think these three bookshave a lot of information that is usable in any career or path one might choose.