anonymous
  • anonymous
What is limit?
Mathematics
  • Stacey Warren - Expert brainly.com
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jamiebookeater
  • jamiebookeater
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nowhereman
  • nowhereman
Do you know what a infinite sequence is?
anonymous
  • anonymous
( I am only 14 years odl yet, And want to learn earlier :) )
anonymous
  • anonymous
hmm I don2T know its turkish .. explain ?

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nowhereman
  • nowhereman
Basically it's a function from the the natural numbers into any other set. (e.g. real numbers). So for every number/position 1,2,3,... you have an element of your set. That's just what's meant by sequence. And infinite, because the natural numbers don't end, so neither does your sequence. For example you could have a constant sequence 7,7,7,7,... or you could have the natural numbers themselve: 1,2,3,4,... or you could have 1/ all even numbers: 1/2, 1/4, 1/6, 1/8, ... All those are infinite sequences.
anonymous
  • anonymous
ok i got it
nowhereman
  • nowhereman
Limits come to live, as you want to know how these sequences behave at infinity. If the limit of a sequence exists, the sequence tends more and more to that limit. For example the last sequence there 1/2, 1/4, 1/6, ... goes to 0. In more rigour terms you can say, that no matter how small an ε > 0 you choose, the sequence will eventually stay closer to the limit than that ε.
anonymous
  • anonymous
hmmm so how can we use these?
anonymous
  • anonymous
we do the process near of the "lim" keyword till the count under of it arives to the limit?
nowhereman
  • nowhereman
The most noted application is with derivations. I guess you know about slope of straight lines of the plane. For general functions, it is much more difficult to give a slope and of course it's value depends on the point you choose. So you start by drawing a secant on the function, which will cut the function graph at the points (x, f(x)) and (y, f(y)). Then you can calculate it's slope \[\frac{f(x)-f(y)}{x-y}\]. But that only exists for \(x \neq y\). So you have to take a sequence of x which tends to y and see where that quotient goes. That is the slope of \(f\) at the point \(x\).
anonymous
  • anonymous
ahh ok i got it
nowhereman
  • nowhereman
So well, there are two types of limits, to be fair. The one I showed you first was for a sequence, if you name your sequence \(a_1, a_2, a_3, \dots\) then you can write it as \[\lim_{n→∞}\;a_n\] But then you can introduce another limit, for a function \(f\) (so maybe just a simple term) and write \[\lim_{x→x_0}\;f(x) = y\] which means that for any sequence that tends to \(x_0\) the function value tend to y:\[\forall (x_n)_{n=1}^∞: \left( \lim_{n→∞}\;x_n = x_0 \right)⇒ \left(\lim_{n→∞}\;f(x_n) = y\right)\]
anonymous
  • anonymous
kk^^ function f =??
nowhereman
  • nowhereman
f can be any function
anonymous
  • anonymous
ahh k ^^
anonymous
  • anonymous
so it does the process near of the "lim" till the squence comes to its limit (sorry for a bad english :( )
nowhereman
  • nowhereman
Yes, but there is no guarantee, that the process will succeed to lead to one particular number. For the last part you also would like to have, that, as the x approaches \(x_0\) the function values approach \(f(x_0)\) but that must neither be the case. If it is, you say, f is continuous at \(x_0\)
anonymous
  • anonymous
hmmm k^^
nowhereman
  • nowhereman
I guess you can find a lot on it also on wikipedia ;-)
anonymous
  • anonymous
:-) ty much ^^
anonymous
  • anonymous
and can you help me in my other question?
nowhereman
  • nowhereman
Let's see.

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