Folks, get Siobhan Roberts' book "Genius At Play" to learn more about his life, and about his many other results, in game theory, and his work with Martin Gardner, Elwyn Berlekamp and Richard Guy... Invented notations for polyhedra, worked on octonions and number theory, and even published on free will. As he had to, I must end somewhere, but his work lives on! Farewell!

Coronacrisis, Iceland's Testing Strategy

Just wanted to tell @dredmorbius about the following, and the above seems like a nice supplement:

> "Iceland has tested a higher proportion of its citizens for coronavirus than anywhere else in the world. Its found about half of those who tested positive are non-symptomatic"

https://twitter.com/passantino/status/1240513400343388160

I have yet to read the linked articles. Thanks for posting, @jeroenpraat, and for boosting, @rysiek

If your spacecraft uses fusion or some other nuclear engine, you want as much space as possible between your engine and the crew. Project Orion's designs give a nice idea, and these further have shock absorber thingsies.

The other radiation problem is coming from everywhere, and lots extra from the sun. We don't know about a good way to hold off charged particles, but it's worse with neutrons. Matter shields. Like, lots of water. In all directions around the crew.

covid-19, uk, the numbers

Oh wait, I misread your post. Then 20 is a good guess after all! Ugh.

covid-19, uk, the numbers

Thanks, that sounds more reasonable than the 20 days you had guessed (or set as worst case) when you first published your ansatz. And thanks for that, I find it much convincing than the mere number of positive test results. It's quite difficult to get tested here in Germany, and you have to pay for it (I heard it's 300€ per test), unless you get hospitalized. That's why I don't trust the official figures at all!

covid-19, uk, the numbers

I'd also not worry about cumulative deaths being too high, because you might only want the number of deaths today. Reasoning is this: The number of deaths is a proxy for the number of people infected, it should grow exponentially with the same rate. So it should be dominanted by the more recent future. Maybe we can also say that for any death too long ago we shojld expect there to be more infections to replace it.

covid-19, uk, the numbers

I don't know much about the time from infection to fatality, if anyone has a reference I'd appreciate to hear about it. I think 2% fatalities are a reasonable upper bound. The rest can be inferred from public data, I'd not be too worried that they're off by much. Unless the gov lies a lot about fatalities or positive results, or something really strange is happening with the amount of testing.

covid-19, uk, the numbers

@ColinTheMathmo suggested to estimate the number of infections during exponential growth like so:

num_of_deaths_reported / proportion_of_fatal_cases * daily_infection_growth_rate ^ days_from_infection_to_death

Last time I estimated the growth rate for Germany it was about 1.36. Lower fatality proportion gives higher end result. Time from infection to death is the most significant number.

Ahat does '*' do?

'Chaotic neutral', maybe, but most certainly 'while hallucinating'.

ST:Disco Season 1

At the time I told everybody who cared to listen to watch The Orville instead. And it really is much closer to TNG in spirit. But now that there is Picard I switched to suggest that instead. It's more wild than TNG, but has preserved a noticeable amount of the original spirit, mostly due to Picard reflecting about what he's doing. I really like the fan moments they've put in, and the characters from the original have developed in a convincing way!

*Programming in 2D text*

This evening I'm thinking of two ideas I've thought about several times before, but never together.

The first: Arjun Nair's https://github.com/batman-nair/IRCIS, an esoteric language (art for art's sake) that comes with a cool visualizer. Maybe all languages should.

The second is Dave Ackley's https://movablefeastmachine.org, a tiled processor for very finely grained distributed computation. Programming it is like playing with a cellular automaton.

You mean, from the planet?

@acciomath

- g+ blog archive
- https://refurioanachro.github.io/g-viewer/

Higher maths is cool – come and see invisible worlds with me!

Joined Apr 2017