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Forum: Computers, Math, Science, and Technology Topic: Intergalactic Travel |
| Michael829 |
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Posted: 15 Jan 2018, 3:30 pm
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Replies: 32
Views: 1,231
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| I like the Carpenters' song, and I agree with its sentiments. I had no idea about that side of the amazing Carpenters. I couldn't believe it when I heard the expression "interstellar police". Yes, but, as I said, if, within traveling or communicating distance, there were anyone inclined t... |
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Forum: Computers, Math, Science, and Technology Topic: Intergalactic Travel |
| Michael829 |
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Posted: 15 Jan 2018, 3:02 pm
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Replies: 32
Views: 1,231
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| I like the Carpenters' song, and I agree with its sentiments. I had no idea about that side of the amazing Carpenters. I couldn't believe it when I heard the expression "interstellar police". Yes, but, as I said, if, within traveling or communicating distance, there were anyone inclined to... |
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Forum: Computers, Math, Science, and Technology Topic: Intergalactic Travel |
| Michael829 |
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Posted: 14 Jan 2018, 2:41 pm
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Replies: 32
Views: 1,231
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| It could very well be that the reason that we never encounter extraterrestrials is that technologically advanced societies "flash in the pan"; they arise, briefly flourish, then quickly snuff themselves out due to overpopulation, resource depletion, runaway climate change and war before t... |
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Forum: Computers, Math, Science, and Technology Topic: Intergalactic Travel |
| Michael829 |
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Posted: 13 Jan 2018, 11:46 pm
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Replies: 32
Views: 1,231
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| With even the neatest galaxy (not counting Magellanic Clouds) about 2 million or so lightyears away, intergalactic travel would need some completely new and exotic physical principle that couldn't even be guessed-at now. Even ordinary interstellar travel could only become feasible in the very distan... |
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Forum: Computers, Math, Science, and Technology Topic: A couple of maths-related questions.. |
| Michael829 |
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Posted: 02 Jan 2018, 3:03 pm
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Replies: 45
Views: 2,135
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| It is a horrible abuse of notation to use "O(N)" in this manner. Nonsense. To anyone who hasn't seen the factorial-notation, the factorial symbol "!" can easily be mistaken for a punctuation-mark that indicates strong emotional emphasis. Perhaps you hadn't heard about that punct... |
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Forum: Computers, Math, Science, and Technology Topic: A couple of maths-related questions.. |
| Michael829 |
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Posted: 02 Jan 2018, 3:49 am
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Replies: 45
Views: 2,135
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| (I've deleted my previous post, not because it was incorrect--everything i said in it was accurate. I deleted it because I felt that that talk about tiny and gigantic volumes was too extremely drastically humongous a topic to dump on people at this forum. But the number-comparison in this post seeme... |
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Forum: Computers, Math, Science, and Technology Topic: A couple of maths-related questions.. |
| Michael829 |
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Posted: 20 Dec 2017, 11:54 pm
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Replies: 45
Views: 2,135
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| I'd said: But the error resulted in only a small difference in the answer, as described above. I still don't know what my error was. Found the error. I'd left out one of the operations, when doing that particular problem. Without that omission, i get the right answer for the integral of the natural ... |
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Forum: Computers, Math, Science, and Technology Topic: Why Algebra? |
| Michael829 |
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Posted: 19 Dec 2017, 4:13 pm
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Replies: 24
Views: 1,212
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| Why do students have to learn so much algebra? It’s not helpful in daily life. That depends on what you like, need or want in your life. Yes, some people don't need algebra for the life they choose and like. But the thing is, you don't know for sure that you later won't like a subject that uses alg... |
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Forum: Computers, Math, Science, and Technology Topic: A couple of maths-related questions.. |
| Michael829 |
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Posted: 19 Dec 2017, 3:14 pm
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Replies: 45
Views: 2,135
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| Correction: For 7.6 billion people, the number of orders they can be listed in is ten to the 72-billionth power. That's also that result that is given by Stirling's formula for approximating large factorials. ------------------------------ Previously, I'd said ten to the 75-billionth power. That was... |
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Forum: Computers, Math, Science, and Technology Topic: A couple of maths-related questions.. |
| Michael829 |
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Posted: 19 Dec 2017, 3:22 am
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Replies: 45
Views: 2,135
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| My girlfriend looked up the world's population for me, and said that it's 7.6 billion. The number of orders in which a list of 7.6 billion people can be arranged is about 10 to the 75-billionth power My result for 10 billion people, about 10 to the 100-billionth power, was correct for that number of... |
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Forum: Computers, Math, Science, and Technology Topic: A couple of maths-related questions.. |
| Michael829 |
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Posted: 18 Dec 2017, 12:46 pm
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Replies: 45
Views: 2,135
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| I've encountered two estimates for the number of atoms in the observable universe: 10^78 and 10^85 Those numbers can be written as 1E78 and 1E85 So the number of ways that a list of 10 billion people could be arranged, around 10 to the hundred-billionth power, or IE(1E11), is incomparably larger tha... |
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Forum: Computers, Math, Science, and Technology Topic: A couple of maths-related questions.. |
| Michael829 |
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Posted: 18 Dec 2017, 9:33 am
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Replies: 45
Views: 2,135
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| supposing you had a list of every person in the world, how many orders can you list that? First I want to emphasize how big these numbers are. Of course when one says a trillion trillion, that means a trillion trillions. And likewise, when one says a trillion trillion trillion, that means a trillio... |
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Forum: Computers, Math, Science, and Technology Topic: A couple of maths-related questions.. |
| Michael829 |
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Posted: 17 Dec 2017, 5:23 pm
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Replies: 45
Views: 2,135
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| Yeah, the concepts of infinity and eternity boggle my mind. But nor do I understand how space or time could have an end. In our lives, time doesn't have an end. At a person's end of lives (or at the end of this life if there's no reincarnation), there's a well-deserved peaceful timeless sleep. But ... |
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Forum: Computers, Math, Science, and Technology Topic: A couple of maths-related questions.. |
| Michael829 |
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Posted: 17 Dec 2017, 2:13 pm
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Replies: 45
Views: 2,135
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| I do believe now that a pack of 52 cards can be shuffled 87 billion times 14 cards can be shuffled in 87 billion orders. Multiply the numbers from 1 to 14. (but when you've multiplied from 1 to 10, divide by 1,000,000 before continuing the multiplications from 11 to 14.) The whole product will be 1... |
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Forum: Computers, Math, Science, and Technology Topic: A couple of maths-related questions.. |
| Michael829 |
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Posted: 17 Dec 2017, 12:39 pm
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Replies: 45
Views: 2,135
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| Let me expand a little on my suggestion, in my previous post, to multiply the numbers from 1 to 14, to show that the result will be 87 billion It's easier than it might sound. It will only take a few minutes. (...considering how small most of the numbers from 1 to 14 are) Suppose that a scientific c... |
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Forum: Computers, Math, Science, and Technology Topic: A couple of maths-related questions.. |
| Michael829 |
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Posted: 15 Dec 2017, 1:45 pm
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Replies: 45
Views: 2,135
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| But if you're willing to settle for a few billion possible orders, then you can get by with only 14 cards. 14 cards can be arranged in 87 billion orders. Say you start a stack of cards on the table by putting down only one card. The first card of course can only go in one place in the order, because... |
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