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Goodbye Aberration: Physicist Solves 2,000-Year-Old Optical Problem

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Re: Goodbye Aberration: Physicist Solves 2,000-Year-Old Optical Problem

#171
post #33
post #29

Earlier quoted context omitted.

Gave me shivers reading it. Beautiful example of the incredible mystery of the human mind. Poof! And the solution materialized. Of course, all the groundwork had been laid. All the neurons primed. Just incredible. And that formula. Damn.

That was my thought. Why is it so damn complex? You’d think the solution would be simpler.

> You’d think the solution would be simpler.

Why would I think that?

Re: Goodbye Aberration: Physicist Solves 2,000-Year-Old Optical Problem

#172
post #19

I have not checked the actual paper, but according to the article itself: > Moreover, the solution involved aspherical elements , which are harder to manufacture in a precise way and are thus more costly. > Their findings were published in the article General Formula for Bi-Aspheric Singlet Lens Design Free of Spherical Aberration, in the journal Applied Optics. I’m no expert in optics, but that does not sound like t…

Something like this could be an advance for optical systems where plastic moulded lenses are suitable. One lens could replace several elements in systems with monochromatic light. Think optical drives

Re: Goodbye Aberration: Physicist Solves 2,000-Year-Old Optical Problem

#173
post #168
post #102

Earlier quoted context omitted.

> The point of economics is that it keeps us alive so we can do math The most hacker news comment I read all year

That seems like a circular dependency... Can you do economics without math?

Modern macroeconomists will disagree.

Re: Goodbye Aberration: Physicist Solves 2,000-Year-Old Optical Problem

#174
post #150

Earlier quoted context omitted.

I don't understand the downvoting of the parent here, which is factually correct and worth noting. It's incredibly unhealthy and this is just down to marketing that anybody eats it. You can make really nice chocolate spreads with your own hazelnuts

The needlessly bad-faith "probably accidentally" is factually inaccurate.

Just to clarify: it wasn't bad-faith, I was just (trying to be) sarcastic, as most of the store-bought food nowadays "may contain traces of nuts and/or eggs and/or celery" etc.

Re: Goodbye Aberration: Physicist Solves 2,000-Year-Old Optical Problem

#175
post #92
post #79

Earlier quoted context omitted.

Hazelnut spread is one of those things that is much more commonly referred to as the brand name. No one says "Reynolds wrap" they say "aluminum foil". No one says "hazelnut spread", they say Nutella. No one says "resealable sandwich bags", they say ziploc bags.

Nutella though is a sugar-and-palm/vegetable-oil spread, which - probably accidentally - contains traces of hazelnuts, powdered milk and cocoa.

I think 13% hazelnuts, 8.7% powdered milk and 7.4% cocoa[0], are quite a lot more than "traces". Sure it could be better, but then you could say that about 90% of products in the average supermarket.

[0]Just went into the kitchen to check

Re: Goodbye Aberration: Physicist Solves 2,000-Year-Old Optical Problem

#176
post #168

Earlier quoted context omitted.

That seems like a circular dependency... Can you do economics without math?

Modern macroeconomists will disagree.

You can perhaps do math without economics. It's well known that Soviet Union didn't really have economics, right? Now it's only left to prove that it had math.

Re: Goodbye Aberration: Physicist Solves 2,000-Year-Old Optical Problem

#177
post #9

Fulltext: https://www.researchgate.net/publication/328536020_General_f...

Or on the arXiv: https://arxiv.org/abs/1811.03792 . It also looks like the first author wrote up a local article which seems to have substantially, umm, inspired the linked write up: https://transferencia.tec.mx/en/2019/02/21/eureka-they-find-... .

Re: Goodbye Aberration: Physicist Solves 2,000-Year-Old Optical Problem

#178
post #149

Earlier quoted context omitted.

The economy is, and always has been, the society. I get that your comments are playful, at least in part, but the thing that makes discoveries worthwhile is usually getting them in the hands of mere mortals.

Since they put the paper on the arXiv, any mere mortal with internet access can download and read it, and some of them will find that worthwhile. The economy is an important part of society, but only part of it.

arXiv works because of a combination of abundance and game theory; it's lovely that we all have access to such a tremendous resource, but it's not as though it gets to live "outside" the economy.

Re: Goodbye Aberration: Physicist Solves 2,000-Year-Old Optical Problem

#179
post #170

Slightly related: One thing I've learnt in Physics is that there are still a huge number of practical and fundamental problems to be solved. You might expect everything easy will already be done by now but that's just not true. Hence we still manage to write so many papers! In fact many Physicists have too many papers they want to write and not enough time to write them. This was a huge surprise for me coming in to m…

Just yesterday I was watching a video about machining flat surfaces, and it was mentioned that the reason why two very flat surfaces stick together isn't thoroughly understood yet. We can build things that deal with unimaginable precision, create new elements, compute with quantum effects, but we don't know why flat things stick together?

To put it simply, two clean flat surfaces stick together for the same reason each of the two objects is held together in the first place: weak and strong nuclear forces and electromagnetism. However the specifics of this might vary greatly depending on the material and other circumstances.

Re: Goodbye Aberration: Physicist Solves 2,000-Year-Old Optical Problem

#180

> After months of working on solving the problem, Rafael González recalls, “I remember one morning I was making myself a slice of bread with Nutella, when suddenly, I said out loud: Mothers! It is there!” > He then ran to his computer and started programming the idea. When he executed the solution and saw that it worked, he says he jumped all over the place. It is unclear whether he finished eating the Nutella bread.…

Brouwer had similar inspiration from a cup of coffee. In his case, the intuition was that if you stir coffee, there's a "part" of it that stays fixed.

In math terms, f:X->X where X is compact and convex, and f is continuous, has a fixed point (exists x_0 in X, f(x_0)=x_0)

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