news:e86b387c-af56-4063...@googlegroups.com:
> JG: f'(c)= (f(c+n)-f(c-m))/(m+n) [A]
>
> Idiot: That is also the formula for a non-parallel secant line.
> There is nothing in that formula that forces it to be parallel.
>
> JG: It's not the formula for a non-parallel secant line, because I
> stipulate that it's the slope of a parallel secant line. It would be
> meaningless nonsense otherwise.
>
> Idiot: f'(c) is then not the derivative of f at c, it is the slope of
> some arbitrary secant at c.
>
> JG: It is *exactly* the derivative of f at c. If not, then the mean
> value theorem is false and everyone knows that can't be so.
>
> JG: Now, m+n divides f(c+n)-f(c-m) exactly, that is,
>
> Idiot: Define "exactly". Prove your assertion
>
> JG: It was proven in the New Calculus course lessons which had you
> bothered to read, you would have known.
>
> JG: f'(c) = gradient(c) + Q(c,m,n) [B]
>
> Idiot: So it is the gradient plus some other number.
>
> JG: It is the gradient plus ZERO. Q(c,m,n) is always ZERO.
>
> Idiot: So you are saying that the derivative at c is not the same as
> the gradient at c.
>
> JG: It's *exactly* the same.
>
> where gradient(c) is the expression of the gradient in terms of c
> only. Q(c,m,n)=0 in [B].
>
> Idiot: How do you know? It will depend on the value of m and n
>
> JG: No. It never depends on the value of m or n. These do not affect
> the slope of any straight line. If you studied the New Calculus course
> lessons, you would know all these facts.
>
> Idiot: So your method then is to try to divide and simplify
> (f(c+n)-f(c-m))/ (m+n) and then hope that all the terms in m and n can
> be grouped together.
>
> JG: Grrr! There is no chance in the New Calculus. (f(c+n)-f(c-m))/
> (m+n) will produce the derivative exactly. No hoping or wishing.
>
> Idiot: And that those terms in m and n will end up as zero for some m
> and n.
>
> JG: Q(x,m,n) is exactly ZERO. No "ending up" or any other rot.
>
> Idiot: And that what is left will be the gradient.
>
> Where is your rigorous justification for such a simplification to
> always be possible?
>
> Where is your rigorous justification for the Q function to have 0 as a
> possible value.
>
> Where is your rigorous justification for the terms other than the Q
> function to be the gradient at c.
>
> Where is your rigorous justification for there to be no divisions by
> zero when you subsitute values for c, m and n into Q.
>
> JG: Study the New Calculus course lessons!!!!
>
> JG: However, any (m,n) pair of any parallel secant line will satisfy
> Q(c,m,n)=0.
>
> Idiot: Where is your rigorous justification for Q being zero for
> secants parallel to the gradient (slope or derivative) of f at c?.
>
> JG: Study the New Calculus course lessons.
>
> JG: Moreover, the same (m,n) will produce the gradient regardless of
> whether [A] or [B] is used.
>
> Idiot: Where is your rigious justification for [A] to be able to be
> expressed in form [B] for every function f?
>
> JG: Study the New Calculus course lessons.
>
> JG: Let's do an example:
>
> f(x)=x^3.
>
> Suppose we want to find the derivative at x=3.
>
> f'(x) = { 3x^2(m+n) + 3x(n-m)(m+n)+(m^2 - mn + n^2)(m+n) } / (m+n)
> [A]
>
> Idiot: Only for SOME values of m and n
>
> JG: No. Once we have any (m,n) pair, then we know that any other pair
> (p,q) such that c-m<c-p and c+p<c+n will work.
>
> f'(x) = 3x^2 + 3x(n-m)+m^2 - mn + n^2 [B]
>
> Idiot: Only for SOME values of m and n
>
> JG: Answered.
>
> JG: Or f'(x) = gradient(x) + Q(x,m,n) [C]
>
> Idiot: Only for SOME values of m and n
>
> JG: Answered.
>
> Idiot: Where is your rigorous justifications that the terms you get
> after you groups terms in m and n as Q(x,m,n) will be the gradient?
>
> JG: Study the New Calculus course lessons.
>
> JG: where gradient(x)=3x^2 and Q(x,m,n)= 3x(n-m)+m^2 - mn + n^2
>
> To find any valid pair, we use x=3 with either of m or n. So let's
> choose m=1.
>
> Then,
>
> Q(3,1,n)=3(3)(n-1)+(1)^2 - (1)n + n^2 = 9n-9+1-n+n^2=n^2+8n-8=0
>
> So, n=-4+2sqrt(6) or n=-4-2sqrt(6)
>
> Idiot: So you find m and n pairs by assuming the Q(x,m,n) will be
> zero, and then assuming that the resultant secant will have the same
> slope as the f(x) curve at x
>
> JG: No, I don't *assume* anything. I know Q(x,m,n) will be zero
> because that's how I designed it. Nothing is left to chance in the New
> Calculus. There are no kludges as in Cauchy's definition.
>
> JG: Since -4+2sqrt(6) lies to the right of x=3, the (m,n) pair we
> require is (1,-4+2sqrt(6)).
>
> Substituting this into [A], we have f'(3)=27 as expected.
>
> We could also have used [B] with the pair (1,-4+2sqrt(6)):
>
> So, that's how you can find any valid (m,n) pair you like.
>
> Idiot: There is no point in finding m and n, if you are simply
> deliberately choosing m and n that make Q(x,m,n) = 0 and then
> substituting those m and n into Q(x,m,n) to get 0.
>
> JG: You don't have to find m and n at all. But if you had bothered
> studying the New Calculus lessons, you would have known this.
>
> Idiot: So you method is, get a formula for the slope of any secant,
> and express its endpoints as offsets from c (m and n).
>
> JG: Not any secant line. Only a parallel secant line.
>
> Idiot: You simplify the expression and hope that you end up with a
> term not involving the offset and another term that do involved the
> offsets.
>
> JG: Moron.
>
> Idiot: Then you hope that the first term is actually the gradient and
> that the second term can give a value of zero for some values or m and
> n. And you hope that there is no division be zero in either term.
>
> JG: There is no need for hope or wishing or anything of the sort.
> There is no chance in the New Calculus. It is the first and only
> rigorous formulation of calculus in human history.
>
> Idiot: And all that is supposed to be rigorous? Where is your
> rigorous proofs that each of the assumption or hopes in the above is
> valid?
>
> JG: It is all 100% rigorous. Your inability to grasp these things is
> the problem.
>
> This is my final response to you. If you have any more questions, go
> and ask them at my FaceBook page or at Space Time and the Universe on
> the 0.999... thread.
>
Looks like you lied about not posting here again.
And you also haven't addressed any of my questions other than flat out
lying and claiming its in your course (which it isn't).
Troll like you can't help but lie, though.