Life In 19x19

@Marcel
And what if student refuse to do what teacher say? In my life, i meet many bad teachers, and even if some skilled ppl were nominally taught by them, after the teacher-student relation were over (sometimes even before), they always said "He didnt taught me anything, i learned all by myself". And i am not talking only about go, i say it generally.

I still remember one of math teachers in my elemenatry school which was saying that "there is no formula for producing n-th prime number [f(n)=n-th prime number]". When i started to study math i accidentaly ran into article that extensively deal with prime numbers and many formulas and theorem about them. It also contained many formulas that this math teacher denied existence. I wouldnt reccomend that math teacher to even my enemies.

A good teacher is someone who motivates students to learn, but students have to do the ...k.

The fact that "there is no formula for producing n-th prime number [f(n)=n-th prime number]" is correct, but the teacher could have said that f(n) ~ n log(n), maybe this would have fascinated part of his audience.

A good teacher is someone who motivates students to learn, but students have to do the ...k.

An excellent soccer example today on the BBC site:

https://www.bbc.co.uk/news/av/uk-515164 ... od-teacher

A written version is at:

https://www.bbc.co.uk/programmes/articl ... land-discs

AloneAgainstAll wrote:I still remember one of math teachers in my elemenatry school which was saying that "there is no formula for producing n-th prime number [f(n)=n-th prime number]". When i started to study math i accidentaly ran into article that extensively deal with prime numbers and many formulas and theorem about them. It also contained many formulas that this math teacher denied existence. I wouldnt reccomend that math teacher to even my enemies.

Too bad. I don't know about his teaching ability, but he was right about the non-existence of a prime number formula that does not include listing some of them. Oh, sure, you can come up with a formula, f(n), where n is a natural number, that produces all the prime numbers up to 41, but the next value is not a prime. In fact, there is a polynomial that will produce the sequence of all known primes. So what?

jlt wrote:The fact that "there is no formula for producing n-th prime number [f(n)=n-th prime number]" is correct, but the teacher could have said that f(n) ~ n log(n), maybe this would have fascinated part of his audience.

Well, since they were in elementary school, some of them might have fallen off the log.

Ah, I missed the word "elementary". But anyway, my point was that the role of the teacher is to sow seeds. Not every seed will grow into a plant, but some will.

jlt wrote:A good teacher is someone who motivates students to learn, but students have to do the ...k.

The fact that "there is no formula for producing n-th prime number [f(n)=n-th prime number]" is correct, but the teacher could have said that f(n) ~ n log(n), maybe this would have fascinated part of his audience.

Jlt why are you sure that there is no such a formula? Can you elaborate what makes you think that way, or who told you that, or where you heard that, or what is proof that such a formula does not exist? I am most anxious to hear all of this, and i am not telling it with sarcasm or disrespect, or any hostility (everybody who thinks same would be greatly apprecisted if provide me answers for this questions).

Here in attachment is one of such a formulas you just denied existence, you can check that it indeed works (but pls check it after you respond to my questions, its really important to me.

Bill Spight wrote:
Too bad. I don't know about his teaching ability, but he was right about the non-existence of a prime number formula that does not include listing some of them. Oh, sure, you can come up with a formula, f(n), where n is a natural number, that produces all the prime numbers up to 41, but the next value is not a prime. In fact, there is a polynomial that will produce the sequence of all known primes. So what?

Unfortunately your claim that this teacher was right is completely wrong. Do you have any argument to back up your words?

AloneAgainstAll wrote:Unfortunately your claim that this teacher was right is completely wrong. Do you have any argument to back up your words?

Your formula is completly useless. It's order of magnitude worse than a naive algorithm and don't give any theorical insight on the problem (as the [-{k/i}] is just a fancy way to test if i divide k).

Tryss wrote:

AloneAgainstAll wrote:Unfortunately your claim that this teacher was right is completely wrong. Do you have any argument to back up your words?

Your formula is completly useless. It's order of magnitude worse than a naive algorithm and don't give any theorical insight on the problem (as the [-{k/i}] is just a fancy way to test if i divide k).

But its correct, right?Did i ever said its usefull for computing prime numbers? We talk about existence and correctness, not usefulness, right?

If i didnt convinced you, think about this way - lets say i have completely unusefull formula which produce nontrivial zeros of Riemman-Zeta function. Would you be interested to see it, or would you just say, its useless for computing them?

AloneAgainstAll wrote:Here in attachment is one of such a formulas you just denied existence, you can check that it indeed works (but pls check it after you respond to my questions, its really important to me.

What do you mean when you say that the formula works?

Thanks.

It means that for any natural number n, this formula produce n-th prime number.

I thought that meaning of "formula works" is same as "this formula is correct (produce correct results, produce results expected)", but i guess thats not the same.

AloneAgainstAll wrote:It means that for any natural number n, this formula produce n-th prime number.

I thought that meaning of "formula works" is same as "this formula is correct (produce correct results, produce results expected)", but i guess thats not the same.

Well, since you mentioned plural formulae, there could be a different way for each formula to work.

What is the simplest formula that works?

Heureka, I found the meaning of life.
It is the "meaning of life"!

Gomoto wrote:Heureka, I found the meaning of life.
It is the "meaning of life"!

Elvis lives.