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<!-- Math High: Leonhard Euler
Author: Elie Abboud
Date: September 13th, 2020
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<title> Math High Leonhard Euler </title>
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<h1> Leonhard Euler (1707-1783) </h1>
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<p>The greatest mathematician of the eighteenth century, <strong> Leonhard Euler </strong> was
born in Basel, Switzerland. There, he studied under another giant of
mathematics, <strong> Jean Bernoulli </strong>. In 1731 Euler became a professor of physics
and mathematics at St. Petersburg Academy of Sciences. Euler was the most
prolific mathematician of all time, publishing over <em> 800 different books and
papers </em>. His influence was felt in physics and astronomy as well.
He is perhaps best known for his research into mathematical analysis. Euler's
work, <cite> Introductio in analysin infinitorum (1748) </cite>, remained a standard textbook in the field for
well over a century. For the princess of Anhalt-Dessau he wrote
Lettres à <cite> une princesse d'Allemagne (1768-1772) </cite>, giving a clear
non-technical outline of the main physical theories of the time.
One can hardly write a mathematical equation without copying Euler.
Notations still in use today, such as <var> e </var> and Π, were introduced
in Euler's writings. Leonhard Euler died in 1783, leaving behind
a legacy perhaps unmatched, and certainly unsurpassed, in the annals
of mathematics.</p>
<aside>
<h1> The Most Beautiful Theorem? </h1>
<p> Euler's Equation </p>
<p> cos <var> (x) </var> + <var> i </var>sin <var>(x) </var> = <var> e </var> <sup>(ix) </sup> </p>
<p> demonstrates the relationship between algebra, complex analysis,
and trigonometry. From this equation, it's easy to derive
the identity </p>
<p> <var> e </var> <sup>(Π <var> i </var>) </sup> + 1 = 0 </p>
<p> which relates the fundamental constants: 0, 1, Π, <var> e </var>, and <var> i </var> in
a single beautiful and elegant statement. A poll of readers
conducted by <cite> The Mathematical Intelligencer </cite> magazine named
Euler's Identity as </mark> The most beautiful theorem in the history of mathematics.</aside>
</p>
<footer> Math High: A Site for Educators and Researchers </footer>
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]]>Enjoy the holiday, forget about the forum for a while! :-)

Okay. But, and it is a big BUT, people don’t want to type a filename AND select a dropdown in N++.

Or maybe they do, because we used to have huge noise about how N++ wouldn’t autoappend the extension based upon what they chose in the dropdown.

]]>Didn’t you mean to say .xxx and not ,xxx ?

Sorry that was a typo that got through. I’m posting using the small phone screen whilst on holiday.

NPP has 2 settings for how it saves a file I believe one will allow you to type what you believe to be an extension but in fact will then apply a further extension based on the setting in the next field `save as type`

. Your typed extension now becomes just a part of the filename.

This is how malware gets to run, someone sees `.html`

in a file explorer window, forgets that registered extensions don’t show and double clicks on it. Windows then uses the hidden extension say `.exe`

and the malware executed.

Terry

]]>I’m getting more confused now.

Didn’t you mean to say `.xxx`

and not `,xxx`

?

I don’t see a comma in anything the OP might have been trying to do.

So, if you really meant:

In this situation the

`.xxx`

is just a part of the filename. Only the last`.`

and following characters are the true extension and what Windows uses to determine the default application to open with.

That is absolutely correct.

But what I thought you were getting at with your earlier post was that probably the user typed `somefilename.html`

at the save prompt and pressed Enter. Then Notepad++ appended `.txt`

to arrive at `somefilename.html.txt`

Is that not what you were getting at?

My contention is that if user does this, they *will* end up with `somefilename.html`

, because `.html`

is a known type to Windows.

Indeed, if I try it, I get exactly that.

However, if I try to make it “fail”, I can, with this example:

If I tell it `somefilename.htmlzz`

then I end up with `somefilename.htmlzz.txt`

, because, `.htmlzz`

is not a known thing, to Windows.

But really, it feels like I have a “disconnect” with what is being discussed.

]]>that xxx is a type unknown to Windows?

In this situation the `,xxx`

is just a part of the filename. Only the last `,`

and following characters are the true extension and what Windows uses to determine the default application to open with.

Terry

]]>Good thought, but wouldn’t that require, when a file gets saved as `somefilename.xxx.txt`

, that `xxx`

is a type unknown to Windows?

In this case, one can hardly believe that an extension such as `html`

is an unknown to any possible configuration of Windows a user might have.

I try to open it with google chrome nothing shows up just an empty page.

My initial guess is that you have a file called `somefilename.html.txt`

, the `.txt`

extension will be added by Notepad++ if you type a filename without changing the save as type also.

You can easily check this by finding the file using windows explorer and double clicking to open it. I bet it opens in windows notepad (that’s the default application). Windows by default hides the extensions of registered file types of which ,txt is one. The icon attached to the file when seen in explorer is also an indicator. If truly an html file it will have an IE or Chrome icon.

This issue has occured before so if you want to use the forum search function type in `html browser`

and have a look at some of the previous instances where posters had a similar problem to yours. There may be a solution within those if my description is not the problem you have.

Terry

]]>