ex-xian said:
With a delta-epsilon proof, show that...
I see that you forgot about:
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kaiser:
off course I agree with this definition. I meant for you to provide the definition for the limit of S(n), no need delta epsilon at this point. A limit can be defined using epsilon and S(n). At any case, I am not interested in your definitions at the moment. I need to be convinced that you understand and know how to use the fundamental "conventional" mathematical definitions before we can move on to your definitions.
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Lama:
Ok, the main persons in modern Math that are related to the so called rigorous definition of the limit concept are Cauchy and Weierstrass.
Cauchy said:" When some sequence of values that are related one after the other to the same variable, are approaching to some constant, in such a way that they will be distinguished from this constant in any arbitrary smaller sizes that are chosen by us, then we can say that this constant is the limit of these infinitely many values that approaching to it."
Weierstrass took this informal definition and gave this rigorous arithmetical definition:
The sequence S1,S2,S3, … ,Sn, ... is approaching to (limit) S if for any given positive and arbitrary small number (e > 0) we can find a matched place (N) in the sequence, in such a way that the absolute value S-Sn (|S-Sn|) become smaller then any given epsilon, starting from this particular place in the sequence
(|S-Sn| < e for any N < n).
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And then I clearly and simply explain in
https://www.physicsforums.com/showpost.php?p=275250&postcount=318 why I do not share these reasoning with the rest of you.
Again, my work is in the most fundamental levels of the basic concepts of the language of Mathematics, and all I need is to show that I understand the reasoning behind these basic concepts, and I clearly showed that I understand the reasoning behind it.
Now after I showed it, I want you to show that you can understand my different point of view about these fundamental concepts.
And you have to understand that in this gentle level your technical skills cannot help you, but only your most simple ability to understand deep things, that cannot be thought by any external method.
It is like a swing in jazz, you have it or you don't have it, and no school can give you the swing.
So, I have a very simple question to you.
Can you take off your boxing gloves and try to understand my reasoning with your bear hands?