On Thursday, May 14, 2020 at 1:38:24 AM UTC+2, Eram semper recta wrote:
Finally SOME MATH! (What a relieve!)
> > "Now it's rather straightforward to get "your" formula from
> >
> > f(x) = f(a) + f'(a)(x-a) + h_1(x)(x-a) . (*)
> >
> Nope.
Yes. Just READ THE FUCKING POST, you dumb asshole!!! (Actually, it's hard to decide who's the bigger asshole: you or JB.)
> > In (*) we substitute (simultaneously) "x+h" for "x" and "x" for "a".
> > This way we get
> >
> > f(x+h) = f(x) + f'(x)h + h_1(x+h)h .
> >
> If you substitute "x" for "a", you get ZERO, you fucking MORON!
*sigh* I said:
we substitute ***simultaneously*** "x+h" for "x" and "x" for "a"
So let's focs on the term:
> h_1(x)(x-a) (**)
>
> Let's see:
Yes. :-)
After the ***simultaneous*** substitution of "x+h" for "x" and "x" for "a" we get:
> h_1(x+h)(x+h-x) = h_1(x+h)h
Right.
> What the fuck is h_1(x+h)h ?!
Huh?!
A formula?
> THINK, you big ape. THINK.
I'll try. So what? Huh?!
What's the problem with the formula
h_1(x+h)h = h_1(x+h) * h ?
Note that "h_1" is just a function symbol for a function taking exactly one parameter. In this case x+h.
> Redmond <bla>
My derivation is in NO WAY (directly) related to anything Mr. Redmond said.
Well, you see: This way we get:
> > f(x+h) = f(x) + f'(x)h + h_1(x+h)h .
> >
> > From this equation we get (for h =/= 0):
> >
> > (f(x+h) - f(x))/h = f'(x) + h_1(x+h) .
> >
> > So your Q(x,h) is just h_1(x+h)
which a simple comparison with your formula
(f(x+h)-f(x))/h = f'(x) + Q(x,h) .
reveals.
In other words, with the definition Q(x,h) =df h_1(x+h), we finally get your "theorem":
(f(x+h) - f(x))/h = f'(x) + Q(x,h) ."
Note that we only applied extremely simple "transformations" to (*) to get "your theorem".
In other words, (*) is just "your theorem" _in a slightly different form_.
Holy shit! You really are a pain in the ass.