User talk:Husseinshimaljasimdini

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Name:hussein.shimal.jasim.dini Location:baghdad-iraq. Specialty:physicist.university of baghdad. personal contact:jasimshimal@yahoo.com http://cid-966d6907c15fe410.spaces.live.com/

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[edit] Welcome

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JohnCD (talk) 11:06, 10 February 2008 (UTC)

[edit] Logical systems,new principles and attempt to solve collatz conjecture

Another editor has added the {{prod}} template to the article Logical systems,new principles and attempt to solve collatz conjecture, suggesting that it be deleted according to the proposed deletion process. All contributions are appreciated, but the editor doesn't believe it satisfies Wikipedia's criteria for inclusion, and has explained why in the article (see also Wikipedia:What Wikipedia is not and Wikipedia:Notability). Please either work to improve the article if the topic is worthy of inclusion in Wikipedia or discuss the relevant issues at its talk page. If you remove the {{prod}} template, the article will not be deleted, but note that it may still be sent to Wikipedia:Articles for deletion, where it may be deleted if consensus to delete is reached. BJBot (talk) 11:00, 10 February 2008 (UTC)

I'm sorry, but your article is not suitable for Wikipedia. One of our three fundamental content policies is that we publish No original research. (The others are Verifiability - everything must be referenced to a reliable source - and Neutral point of view). I hope you will not be discouraged and will continue to contribute to Wikipedia, but first read the links in the Welcome paragraph above to understand the requirements for articles. JohnCD (talk) 11:10, 10 February 2008 (UTC)

[edit] Speedy deletion of Image:MY MATH. IDEAS.pdf

A tag has been placed on Image:MY MATH. IDEAS.pdf requesting that it be speedily deleted from Wikipedia. This has been done under section I2 of the criteria for speedy deletion, because it is an image page for a missing or corrupt image or an empty image description page for a Commons-hosted image.

If you think that this notice was placed here in error, you may contest the deletion by adding {{hangon}} to the top of the page (just below the existing speedy deletion or "db" tag), coupled with adding a note on the article's talk page explaining your position, but be aware that once tagged for speedy deletion, if the article meets the criterion it may be deleted without delay. Please do not remove the speedy deletion tag yourself, but don't hesitate to add information to the article that would would render it more in conformance with Wikipedia's policies and guidelines. Oli Filth(talk) 20:42, 12 February 2008 (UTC)

[edit] chain rule

does always dy\dx=1\(dx\dy)?thank you.Husseinshimaljasimdini (talk) 14:04, 16 April 2008 (UTC)

The proposed identity follows quickly from the chain rule. Suppose y = ƒ(x) and x = g(y). Then

{dy \over dx} = f'(x),

and

{dx \over dy} = g'(y).

Now, since

g(f(x)) = x,

we have

{d \over dx} g(f(x)) = 1.

But

{d \over dx} g(f(x)) = g'(f(x))\cdot f'(x)

(that's the chain rule). So

\begin{align} 1 & {} = g'(f(x))\cdot f'(x). \\ \\ 1 & {} = g'(y) f'(x). \\ \\ {1 \over f'(x)} & {} = g'(y). \\ \\ {1 \over dy/dx} & {} = {dx \over dy}. \end{align}

(Of course it doesn't work if it involves dividing by 0. At points where dy/dx is 0, dx/dy does not exist since there's a vertical tangent line.) Michael Hardy (talk) 20:22, 21 April 2008 (UTC)