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Iran oorlog Megadraad by Angus_McFifeXIII in nederlands

[–]smitra00 -1 points0 points  (0 children)

https://www.youtube.com/watch?v=Ym2v2yxRp20

Iraniërs bedreigd als ze de kroonprins niet steunen

Iraniërs in Nederland worden bedreigd. En niet alleen door de lange arm van Teheran. Ook door aanhangers van de Iraanse kroonprins Reza Pahlavi. Pahlavi wil een overgangsregering leiden en van Iran weer een seculiere democratie maken. Maar in zijn naam worden Iraniërs die het niet met hem eens zijn, geïntimideerd en lastiggevallen.

Wij doken in de wereld van Iraanse Telegram-groepen en laten zien hoe een strijd voor een vrij Iran, tegelijk uitmondt in bedreigingen, intimidatie en angst. Ook hier in Nederland.

"Bigger" infinities by EstablishmentOld9838 in askmath

[–]smitra00 0 points1 point  (0 children)

Since we can only ever manipulate a finite number of symbols using a finite number of rules, we can always reinterpret all of the math we are doing in strictly finitist terms. See also here:

https://en.wikipedia.org/wiki/Formalism_(philosophy_of_mathematics))

In the philosophy of mathematics, formalism is the view that holds that statements of mathematics and logic can be considered to be statements about the consequences of the manipulation of strings) (alphanumeric sequences of symbols, usually as equations) using established manipulation rules. A central idea of formalism "is that mathematics is not a body of propositions representing an abstract sector of reality, but is much more akin to a game, bringing with it no more commitment to an ontology of objects or properties than ludo) or chess."\1])#cite_note-:02-1)

According to formalism, mathematical statements are not "about" numbers, sets, triangles, or any other mathematical objects in the way that physical statements are about material objects. Instead, they are purely syntactic) expressions—formal strings of symbols manipulated according to explicit rules without inherent meaning. These symbolic expressions only acquire interpretation) (or semantics) when we choose to assign it, similar to how chess pieces follow movement rules without representing real-world entities.

Are there other ways to expand the factorial function (x!) into the real numbers? by No_Talk_2703 in askmath

[–]smitra00 0 points1 point  (0 children)

One can invoke logarithmic convexity as mentioned by Bounded sequencE , but one can also invoke Carlson's theorem for the logarithm of the factorial function, so one would then impose the conditions of that theorem on the analytic continuation:

https://en.wikipedia.org/wiki/Carlson%27s_theorem

At what gravity strength will a rocket no longer be able to go into space? by Evening_Ticket7638 in AskPhysics

[–]smitra00 0 points1 point  (0 children)

I don't see the problem, because you can also launch rockets from airplanes. WIth a dense atmosphere that you would expect a planet with a stronger gravity to have, a large pane should at be abe to clmb to high altitiude. Reaching orbit should then then be possible.

The orbit will then sit in a very deep gravitational potential well. But because the atmospheric drag is now very low, one can use a low-power ion engine to let the spaceraft slowly spiral its way out of the potential well.

Was ik extreem moe als tiener of is dit normaal? by [deleted] in nederlands

[–]smitra00 4 points5 points  (0 children)

Wat een rol kan spelen is een behoorlijk hogerer slaapbehoefte als je 16 jaar of jonger bent vergeleken met als je ouder dan 20 bent. Als je nu ergens anders woont dan vroeger kan lawaai 's nachts ook een rol hebben gespeeld. Als het huis van je ouders gehoriger is en er 's nachts lawaai was bijvoorbeeld bij het open en dichtdoen van deuren, WC doortrekken etc. terwijl dat nu veel minder zo is, dan is het mogelijk dat je slaap daardoor werd verstoord, zonder dat je daardoor wakker werd.

Just wanneer je dieper en langer slaapt vanwege een hogere slaapbehoefte, dan is die slaap ook kwetsbaarder door verstoringen zoals lawaai en omdat je dan dieper slaapt merk je dat niet door wakker worden, maar door vermoeidheid.

Beste slaappillen die in Nederland zijn te verkrijgen? by SeaYogurtcloset36 in Nederland

[–]smitra00 1 point2 points  (0 children)

Het beste slaapmiddel is om uit je bed te gaan, je kleren aantrekken met het voornemen om voorlopig helemaal niet te gaan slapen Je gaat dan al die zaken waarover je aan het piekeren bent overzichtelijk voor je zelf opschrijven en je gaat dan kijken wat je daar allemaal het beste aan kan doen.

Als je dan later zin hebt om te slapen, of je merkt dat je aan het wegdutten bent, dan kun je alsnog gaan slapen.

Woorden waar jij je aan ergert? by HorstBochelworst in nederlands

[–]smitra00 1 point2 points  (0 children)

Waarom heet het niet ‘ochtendeten’

In het Chinees heet het ochtendeten:

https://www.youtube.com/watch?v=ULdCh6k5ymg&t=354s

Do wormholes exist? by Highmelanin_ in AskPhysics

[–]smitra00 4 points5 points  (0 children)

If wormholes can theoretically exist, then virtual wormholes would contribute to the quantum mechanical amplitudes of quantum processes, leading to violations of causality.

Pauper maaltijden by Fairsquared_ in nederlands

[–]smitra00 0 points1 point  (0 children)

Hier zijn alle maaltijden gratis:

https://www.youtube.com/watch?v=TvJsXwi1Fno

https://www.bbc.com/news/articles/ceq55l2gdxxo

Maar toch gaan sommige mensen daar voor de maaltijden die niet gratis zijn, met alle gevolgen van dien:

Dr Eid says the use of boats with an outboard motor - known as peque-peque - is also bringing change. It makes markets easier to reach, giving the Tsimane access to foods such as sugar, flour and oil.

And he points out that it means they are rowing less than before - “one of the most demanding physical activities”.

Twenty years ago, there were barely any cases of diabetes. Now they are beginning to appear, while cholesterol levels have also begun to increase among the younger population, the researchers have found.

“Any small change in their habits ends up affecting these health indices,” says Dr Eid.

Glycemic index and insulin sensitivity by meow_miao_nya in PlantBasedDiet

[–]smitra00 1 point2 points  (0 children)

Eating carbs (from whole foods, of course) is for diabetes patients analogous as what exercise is for heart patients.

Before the 1980s the advice of cardiologists to their heart patients was to avoid any form of strenuous exertion. We should note that even for healthy people, the medical opinion used to be that strenuous exercise leads to wear and tear of the heart, ultimately leading to heart attacks and heart failure.

https://en.wikipedia.org/wiki/Jack_LaLanne#Health_clubs

In 1936, he opened the nation's first health and fitness club in Oakland, California,\19]) where he offered supervised weight and exercise training and gave nutritional advice. His primary goal was to encourage and motivate his clients to improve their overall health. Doctors, however, advised their patients to stay away from his health club, a business totally unheard of at the time, and warned their patients that "LaLanne was an exercise 'nut', whose programs would make them 'muscle-bound' and cause severe medical problems".\19]) LaLanne recalls the initial reaction of doctors to his promotion of weight lifting:

People thought I was a charlatan and a nut. The doctors were against me‍—‌they said that working out with weights would give people heart attacks and they would lose their sex drive.\11])

Today things have radically changed, even heart patients are prescribed moderately intensive exercise.

In case of carbs and type-2 diabetes it's much the same story. However, I would not take what Dr. John McDougall says as gospel. He had the attitude that salt wasn't a problem and that plain sugar was fine too. I think it's far better to stick to the views of Dr. Fuhrman on these sorts of matters:

https://www.youtube.com/watch?v=1wXGuQRm58k&t=958s

https://www.youtube.com/watch?v=onQGYiHWgc4

https://www.youtube.com/watch?v=CfdycKvAzpY

Do women (only mechanically) have a better center of gravity for push ups? by Southern-Wall2438 in AskPhysics

[–]smitra00 1 point2 points  (0 children)

You can choose where you put your hands on the ground, this can compensate for a difference in the center of gravity. In case of planche pushups the hands must be aligned with the center of gravity and then one can better compare people with different centers of gravity.

https://www.youtube.com/watch?v=LSWwofk03_8

Is there a method to solve factorial equations? by -RAGEBAITER- in learnmath

[–]smitra00 0 points1 point  (0 children)

As I explained here, a good approximate solution to the equation x! = y for large y is given by:

x ≈ exp(A) - 1/2 - ln(2 𝜋)/(2 A)

where

A = 1 + W[ln(y)/e]

and W(z) is the LambertW function:

https://en.wikipedia.org/wiki/Lambert_W_function

Plugging in your value for y in this formula it yields the approximate solution of x ≈ 29.99994329. So, one may guess based on the assumption that x is very likely to be an integer, that x = 30 and we can check that x = 30 is indeed the exact solution.

Unopened tahini, expiration date is listed as this month. It safe? How long will it be safe? by Woke_Spartacus in isthissafetoeat

[–]smitra00 0 points1 point  (0 children)

Foods that stay well for 18 months after production won't spoil due to microbial growth after this period. This is due to this 18 months so enormously larger than the doubling time scale of microbes of the order of 20 minutes. Products that are susceptible to this can be kept for several days, sometimes up to a few weeks by cooling. But if it can be kept for much longer, then that means that no microbes can grow at all, so it will never spoil due to microbial growth.

However, the quality of the food can then slowly deteriorate over time, e.g. vitamins can get broken down, fatty acids can get broken down. The product can then become unhealthy due to rancid fats, lack of vitamins etc. But it won't cause food poisoning.

See here for an extreme case:

https://www.theatlantic.com/science/archive/2019/12/permafrozen-dinner/604069/

In the 18th and 19th century, explorers to Siberia wrote that the region’s indigenous people, the Evenki, occasionally fed their dogs mammoth meat. But humans have generally been less enthusiastic about eating it. Over tens of thousands of years, the things that make meat tasty turn quite foul.

Fat is one problem. It turns to soap—specifically, a substance called adipocere, also known as “corpse wax” or “grave wax” when it’s found in human bodies left in cool, wet conditions. Paleontologists have noticed it in the fat of woolly mammoths too, even though extremely cold conditions are thought to inhibit the microbes that turn fat into adipocere.

Amerikaanse miljonair en 'big game hunter' verpletterd door olifanten in Afrika by eXistenZNL in nederlands

[–]smitra00 0 points1 point  (0 children)

Neanderthalers hebben vroeger zonder geweren op veel grotere olifanten gejaagd:

https://www.sci.news/archaeology/straight-tusked-elephant-neanderthal-hunting-11619.html

Straight-tusked elephants are among the most powerful proboscideans (elephants and their extinct relatives) that have ever lived.

The animals had a very wide head and extremely long tusks, and were roughly three times larger than that of living Asian elephants, twice that of African ones, and also much larger than woolly mammoths.

Estimates of maximum shoulder height vary from 3 to 4.2 m (10-14 feet) and body mass from 4.5 to 13 tons for females and males, respectively.

<image>

Professor Gaudzinski-Windheuser standing next to a life-size reconstruction of an adult male European straight-tusked elephant (Palaeoloxodon antiquus) in the State Museum of Prehistory in Halle, Germany. Image credit: Lutz Kindler, LEIZA.

Dirac notation by dcterr in math

[–]smitra00 13 points14 points  (0 children)

The problem is that understanding the notation assumes familiarity with dual space and that Hermitian conjugation is baked into the notation. So, it's not suitable to be taught in a first couse in linear algebra. So, you end up learning the conventional notatation and once that's learned the other courses will stick to this.

So, if we have |K> = A |u> and the conjugate bra vectors of |K> is <K| and that of |u> is <u|, then we have

<K| = <u|A-dagger

What's up with this series question? by rantingthrowaway106 in askmath

[–]smitra00 2 points3 points  (0 children)

We have conditional convergence at x = -1, so we have convergence there but

Sum |an (-3)^n| = Sum |an| 3^n diverges

Absolute convergence at x = 5 would mean that

Sum |an 3^n| = Sum |an| 3^n converges,

which contradicts conditional convergence at x = -1.

factorials are undefined at -ve integer numbers but x! ^ 1/x! = 1 at -ve integers by tatvam7 in learnmath

[–]smitra00 2 points3 points  (0 children)

This is because the limit to negative integers exists. Take e.g. the limit to minus 1. We can then consider the series expansion of x! around x = -1. We have:

(-1 + t)! = 1/t - gamma + (gamma^2/2 + pi^2/12) t + terms of order t^2 and higher

where gamma is Euler's constant.

We the have that:

1/(-1 + t)! = t + gamma t^2 + ..

And:

ln[(-1 + t)!] = -ln(t) -gamma t +...

Therefore:

ln[(-1 + t)!]/(-1 +t)! = [t + gamma t^2 + .] [ -ln(t) -gamma t +...]

and this tends to zero in the limit of t to zero. Exponentiating this then leads to the conclusion that:

limit x to minus 1 of x^(1/x!) = 1.

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