yak

@yak@mathstodon.xyz

I like differential geometry, differential geometry doesn't seem to like me very much.

This profile is from a federated server and may be incomplete. Browse more on the original instance.

6d03, to random
@6d03@mathstodon.xyz avatar

the time may have come to throw out the www and start over

yak,

@6d03
Time's been long overdue, IMO. With rare exceptions, it's basically turned into TV 2.

jonny, to random
@jonny@neuromatch.social avatar

They did WHAT
https://retractionwatch.com/2024/02/05/no-data-no-problem-undisclosed-tinkering-in-excel-behind-economics-paper/

yak,

@realn2s
>>economics is the only "science" where the data is regularly adjusted to the model.

I really wish that were true!
@jonny

albertcardona, to random
@albertcardona@mathstodon.xyz avatar

Nigeria, India and China are experiencing pretty bad air pollution, as measured by density of particulates. No wonder China and India are rushing to replace fossil fuels for renewable energy sources. Let's hope Nigeria will follow suit.

https://earth.nullschool.net/#current/particulates/surface/level/overlay=pm2.5/orthographic=50.04,30.21,1179/loc=-0.367,52.198

yak,

@albertcardona
China is moving to open dozens of new coal power plants in the next ten years...

noneuclideandreamer, to CA German
@noneuclideandreamer@mathstodon.xyz avatar

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Genuary Prompt 14: 1KB Art work
I went with XOR output as a txt-file.
But MastoFont doesn't behave...




yak,

@noneuclideandreamer
Cool fact: when you make a really really long line in the game of life, and let it run until it becomes stable, you'll get something like a double-sided Sierpenski triangle.

johncarlosbaez, to random
@johncarlosbaez@mathstodon.xyz avatar

Meta is trying to do something about the Fediverse. We shouldn't assume it's something good. Read this article:

https://ploum.net/2023-06-23-how-to-kill-decentralised-networks.html

yak,

@johncarlosbaez let's not forget what they did to email

jonny, to random
@jonny@neuromatch.social avatar

Scientists will be like "results should be replicable!" but then do all their experiments with a random walk of homebrew code that runs on four computers networked with a nest of BNC cables, each with a different version of MATLAB, and after every experiment the data is saved by walking a flash drive around to each of them since they cant be connected to the internet because one of them still runs Windows XP and if the rest so much as heard of a software update the work of 5 grad students whose whole PhD was spent setting up this monstrosity would be ruined forever.

yak,

@jonny
I'm one of those grad students that maintains a huge, bloated, undocumented, mostly uncommented, absurdly complex piece of software. Currently we can't replicate a lot of the results we claim in old papers, and we can't even figure out why because it's been through at least three different version control systems.

I rewrote the makefiles and I feel like I deserve a Nobel prize just for that.

jeffowski, to random
@jeffowski@mastodon.world avatar
yak, (edited )

@jeffowski
This completely uncritical "center" that everyone loves to meme doesn't really exist. It's a type of person that could only be encountered once or twice on the internet, and they're probably 14.

The people advocating for "a little genocide" are fascists and/or spokesmen for the capitalist class trying to make their policies palatable to liberals.

yak,

@jeffowski
Yeah I guess ten years of being Very Online isn't very long.

SirTapTap, to politics
@SirTapTap@mastodon.social avatar

Every Internet Child Protection bill:

1:"New child safety bill!!"

2: "Wow great! What's in it?"

1: "Well, you have to give your social security number, a picture of the weakest part of your skull, and your home address to Hammers The Clown. You also have to download COVID 19 into your eyeball once per month."

2:"What that sounds terrible what does that have to do with--"

1:"Wow. Ok. HEY EVERYONE THIS GUY HATES CHILDREN!!!!!!!"

yak,

@SirTapTap
Also: "providers of internet services are now required to know when their users are potentially pedophiles, and preemptively ban them. Tough luck if you don't have the resources to do that ;)"
@gasp

gregeganSF, to random
@gregeganSF@mathstodon.xyz avatar

[1/2] A piece of paper that can be bent but not stretched or sheared can be rolled up to form part of a cylinder or a cone, but those aren’t the only intrinsically flat shapes.

For a given curve in space, you can bend the paper so a once-straight line on it follows that curve.

A strip of paper with a checkerboard pattern and its ends joined together bends, without stretching or shearing, so its midline matches a constantly changing curved blue loop.

yak, (edited )

@gregeganSF
Yes, this is how parallel transport was originally defined actually: take a curve and glue a flat space on it, tangent to your manifold. Move your vector up to the flat space, parallel transport it there, then project it back down.

peterrowlett, to random

“If one and a half chickens lay one and a half eggs in one and a half days, how many eggs will nine chickens lay in nine days?”

(Question asked to a robot brain in Escape, a 1945 short story by Isaac Asimov collected in I, Robot.)

yak,

@ColinTheMathmo
Ah, but one and a half chickens must lay as many eggs as one chicken, because half a chicken can't lay any eggs (being dead), and two half eggs obviously can't be put together into a whole egg (I'm imagining a half-egg is some kind of tiny or broken egg). Thus a single chicken lays one egg and one half-egg per 1.5 day interval. Therefore in nine days, nine chickens would lay 54 eggs and 54 half-eggs.
@peterrowlett @OscarCunningham @rmathematicus

yak,

@ColinTheMathmo
I was hoping that if interpreted with this weird reasoning, one of the AI answers would be "correct", which would be funny. Unfortunately it turned out that the actual answer is "correct" which I also thought was funny.
@peterrowlett @OscarCunningham @rmathematicus

albertcardona, to academia
@albertcardona@mathstodon.xyz avatar

"Asymmetries in trust", new blog post on the disconnect between academics and the associated academic bureaucracy.

https://albert.rierol.net/tell/20230823_asymmetries_on_trust.html

yak,

@albertcardona
One runs in to this as a PhD student all the time. I am required to enroll inat least 6 credits every semester, even though I can take as many credits as I want of "research and directed reading". All it does is make more headache for the department admin.

fsinn, to random

There are more than 74,000,000 people who voted for a Republican to become President in 2020, and this lineup is the best the party can come up with? For President?

It deserves to die.

yak,

@accretionist
@fsinn
"religious" and "political" were never very far separated in the first place. And, while thirty percent of the population isn't going to win you an election, it is more than enough to seize state power if you're prepared enough.

In any case I think psychologizing the politics of the other is usually not a great move, it downplays how serious they really are. The most terrifying thing about Nazis is that they are just as intelligent and rational as us.

ramankhutu, to random

You can put whatever demands you want in a document and have a person sign it, but unless there's an "or else" consequence included, the document is essentially meaningless. I've seen too many contracts completely ignored by signatories to ever believe anyone can be bound by some "shall not" terms in a bond agreement.

yak,

@ramankhutu
Generally if someone else doesn't hold up their end of the contract, you are under no obligation to continue to hold up your end. So the implied "or else" is that the contract is void.

If you already held up your end (e.g. paid for a service) then you can sue for breach of contract and probably get your money back. If you can even afford the legal fees or time to do so, that is.

yak,

@ramankhutu
The letter of the law is that you can't do that. Of course in practice people do get away with it because the legal system is pay-to-win.

ramankhutu, to random

What's great about screaming "Aaaaaaaaahhh" at the top of your lungs in a public place on a Friday night is that it could be an expression of ultimate joy or abject horror, and nobody is going to ask you which.

yak,

@ramankhutu
Most people will probably assume you're just crazy lol

ramankhutu, to random

How am I supposed to be seeing a 24% decline in the last year in this supporting graph? It looks like maybe 1-2% to me but it's described in the Washington Post article as a "plummet."

https://wapo.st/3DIlF9c

yak,

@ramankhutu
Either a misleading graph or somebody forgot to put a dot in there and the story wasn't fact-checked. Either way, pretty sad to see the Washington post putting less effort into accuracy of reporting than many blogs.

gregeganSF, to random
@gregeganSF@mathstodon.xyz avatar

Differential geometers, is there a special name for a coordinate system such that the metric tensor (in an extended coordinate patch, not just at a point) has 1 for all its diagonal elements (but off-diagonal elements can be nonzero)? Equivalently, all coords are proper lengths.

yak,

@gregeganSF
I think that condition is equivalent to normal coordinates.

yak,

@gregeganSF
I think it would remain 1 on the diagonal regardless, because the condition you want is (\langle\nabla_X X, X\rangle =0) for each coordinate vector field X. In normal coordinates we would have (\nabla_X X = 0), since (X_p = d/dt exp_p((0,...,t,...,0))) is the derivative of a geodesic.

JoshuaHolland, to random
@JoshuaHolland@mastodon.social avatar

Yesterday was the 3rd day this week that the Earth broke temperature records yet where I live people routinely leave the engines running in their giant vehicles while they go shopping or whatever

The cherry on top of this sundae of stupidity is that car theft is probably the top crime around here

yak,

@JoshuaHolland at least for older cars, leaving the engine running for <1 minute is usually more gas efficient than stopping and starting a car. Engines are significantly less efficient for the first 30 seconds or so that they're turned on. This is especially true in colder climates.

ramankhutu, to random

Guy in Dublin bar: "Can I ask what kind of equations you're working on?"
Me, kinda not in the mood: "Well, it's kind of a fluid mechanics thing."
Guy, satisfied: "Oh, a floomaka? OK!"

I don't know what a "floomaka" is in Dublin, but apparently it's more meaningful than "Ramankhutu."

yak,

@ramankhutu
I could imagine students in engineering/physics adopting "floomaka" to mean "fluid mechanics".

deilann, to random

the easiest way to fix the issue of scams and robot calls is quite obvious: address global poverty

but the scams only hurt the 99% so that'd just be too much effort

yak,

@deilann
@axoaxonic
That doesn't sound very easy, actually.

yak,

@deilann
But scammers are a subset of people in the way of ending global poverty.

ct_bergstrom, (edited ) to random

This week, Science published a stunningly irresponsible news story entitled "Fake scientific papers are alarmingly common" and claiming that upward of 30% of the scientific literature is fake.

https://www.science.org/content/article/fake-scientific-papers-are-alarmingly-common

Below, the first two paragraphs of the story.

Headline and intro notwithstanding, the story itself later notes that the detector doesn't actually work and flags nearly half of real papers as fake. Does the reporter just not understand that?

h/t @Hoch

yak,

@ct_bergstrom
@Hoch
This paper sounds fake tbh

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