Strange

! Moderator Note The rules you agreed to when you joined require that you provide support for your claims. If you are unwilling or unable to do that then this thread will be closed.

There is a lot of variety in Siberia and China. So I don't think you can really say there is a single "look". People also got to the Americas from other places at different times, so the native population would have had a bit of a mixed background. One common trait that is common in Asia is the epicanthic fold (which gives eyes their distinctive appearance) this is also common among native Americans. Really, "it doesn't look like it to me" is about the lowest possible standard to judge something. Using objective evidence is better.

This analogy is good for just one thing, explaining the surface of last scattering, but it is very good at that: https://www.researchgate.net/figure/The-Surface-of-Last-Screaming-Consider-an-infinite-field-full-of-people-screaming-The_fig5_1931578

Seconded. Even some really simple ideas can take time to get your head around. It took years for me to really make sense of why we still see the cosmic microwave background; I mean, I understood the explanation but in a "yeah, I suppose so" sort of way. Eventually, a really good analogy(*) made me go "oh, of course". (*) The "surface of last screaming"

It's the other way round. When you reduce the volume (and increase the pressure) the temperature increases. Like when you pump up your bicycle tires: the pump can get very hot. And when you release the pressure, it gets colder. If you use an aerosol paint spray, the can will get very cold after a few minutes. This is how the heat pumps in refrigerators work. Maybe you are thinking of cooling a gas so it condenses to a (denser) liquid and then freezes to a (denser) solid? But in that case, the heat has to leave the gas and the liquid in order for it to cool down. The universe is a closed system, so there is nowhere for the heat to go, so the temperature, volume and pressure are related by the ideal gas laws.

The most popular machine learning frameworks seem to be TensorFlow and PyTorch. These are both based on Python.

! Moderator Note OK. I don't know what you are up to, but stop it. Copying the complete contents of web site with no attribution is a violation of copyright.

You can find anything on the web. That doesn't mean it is true, or even "information". Presumably, those people talking about the supposed "health risks of synthetic leather" are claiming it is "not natural" or some such nonsense. If you can't provide an example of what you retaking about then it is hard to comment. But I would suggest it is probably nonsense. I just walked past our local leather-workers shop. It smells very strongly. I think it is a rather nice smell. Someone else might think it is unpleasant. You need more than subjective opinions. Of course you can. No one needs synthetic leather (or even real leather). The truth about what? You need to let us know what you are talking about. Something more specific than "you can find stuff on the Internet" Really how serious? You have posted nothing to suggest that it is in the least bit serious.

Very good But only if the universe is infinite. 🙂

Did you read the reply to your previous thread:

Sigh. That is the problem. Colston (and others) are only known for their Great WorksTM - that is why the statue exists existed, and is all that was mentioned on the plaque. As pointed out earlier, attempts to bring even a small amount of balance were blocked. There might be some people who would say that we shouldn't even acknowledge the good things that such people did, but I think that is going too far. First note that he was a slave trader and mass murderer and then record (not as a justification, just as a fact) that some of his money was used for philanthropic purposes.

! Moderator Note Time is not measured in cubic metres. A video in Russian is not an explanation. Referencing another crackpot paper is not support. You have still not explained what this thread is about. Do not bring this topic up again.

! Moderator Note So "x" is an unknown quantity to solve for? You have one more chance to actually explain what you are talking about or this thread will be closed.

1. Digits 2. Principles

! Moderator Note I have moved this to Speculations as it is completely unclear what it is about. I was very tempted to move it to Trash. None of your terms are defined. There is no explanation. Provide a clear explanation of what you want to discuss, in one or two sentences in your next post.

Look at my rectangle example: you can make the ratio of perimeter to area as large as you want

! Moderator Note Do not hijack other people's Speculation threads with with your won Speculation

No. And the council have been trying for years to get a new plaque put on it. But they couldn't get agreement on words describing his involvement. So there was zero chance that he was ever going to be seen as anything other than a generous philanthropist based on the statue.

! Moderator Note Try again by asking a question that makes sense.

Not the cows Where have you heard that? If it were true, its use would not be permitted. Do you worry about the chemicals used to cure and dye real leather? Don't use them, if you are worried.

Explain what about regression? What do you know already? Have you got a textbook? Google? You might as well ask "Please tell me everything about all subjects." Not even a please or thank you? ! Moderator Note And stop posting things in "Computer Help" - you are not asking for help with your computer. Move to Computer Science. (Although mathematics might be better.) OK. Here is an interesting fact about "regression" (assuming you mean the mathematical method fitting data). Sir Francis Galton (1822 - 1911) noticed that the children of parents with above or below average height tended to be closer to average height. He referred to this phenomenon as "regression towards mediocrity." He then developed mathematical tools to analyse these tendencies. This came to be known as regression analysis.

Consider a rectangle that is 100m long by 1cm: its area will be 1 m2. and its perimeter is about 200m. This is the same as a square 1m x 1m, but that has a perimeter of only 4m. Why? Because one is long and thin and the other is square. A circle is even more "efficient" than a square and so has a shorter (the shortest) perimeter for a given area.

You have said everything I was going to say Well, one more thing. The "list of lists" or "array of arrays" description is one way of thinking about 2D arrays, and is how many programming languages work. But you can also think of it as an explicit, 2D array: A = [11, 12, 13, 14, 15, 16; 21, 22, 23, 24, 25, 26; 31, 32, 33, 34, 35, 36] That is a 3x6 array. Some languages treat multidimensional arrays like this so you can references elements of the array as A[2,4] (which would equal 24 in this example). And just a bit of terminology. A 1D array is often called a "vector" in mathematics. A 2D (or higher dimensional) array is called a "matrix". In some programming languages, arrays of any number of dimensions are called "tensors". Lists and arrays are very similar concepts. Some languages have either lists or arrays. Some have both, with slightly different properties. Typically, an array has a fixed size while a list can have things added to the end, or inserted in the middle.

! Moderator Note There is no such thing. And you were told to stop posting this sort of nonsense.

I'll show you the first few steps. See if you can go from there: [math](T_a)_{rear} = \frac {\frac{L_a}{2} - v(T_a)_{rear} }{c}[/math] Divide the RHS through by c [math](T_a)_{rear} = \frac{L_a}{2c} - \frac {v}{c}(T_a)_{rear} [/math] Take Ta to the other side: [math](T_a)_{rear} + \frac {v}{c}(T_a)_{rear} = \frac{L_a}{2c}[/math] Can you see the way from there? (Hint: you can create a [math](1 + \frac {v}{c})[/math] on the LHS) General advice? Practice lots of basic algebra problems!