Project Euler Forum

mpiotte wrote:It can also be rendered with: "\sum_{{i=1} \atop {i \le n}} i"
$\sum_{{i=1} \atop {i \le n}} i$

If you use \displaystyle before the \sum it will force the same effect of using double dollar signs for inline equations. That is, it will render a larger sigma with the limits directly below rather than placed to the right: \displaystyle \sum_{{i=1} \atop {i \le n}} i produces $\displaystyle \sum_{{i=1} \atop {i \le n}} i$.

Am I missing something or isn't $\displaystyle \sum_{{i=1} \atop {i \le n}} i$ just the same as $\displaystyle \sum_{i=1} ^n i$?

@mdean: Did you try refreshing the page? Is it still persisting for you?

euler wrote:@mdean: Did you try refreshing the page? Is it still persisting for you?

Refreshing didn't help. That last post alone contained 4.

I get [Math Processing Error] too using IE 11, but it works fine using Firefox 35.0.1. Note that MathJax updated to 2.5 a few days ago: http://www.mathjax.org/news.

Which thread are you both referring to? All the posts in thread 479 and 478 are viewing fine for me in all browsers: Firefox, Chrome, and IE11, with the exception of formulae in asgerix's posts because he is using those double underscores in the limits of the summation; they are just appearing in black boxes un-rendered.

@Martin: The update may be responsible as we are using the Cloud Distributed Network with the latest version. It is possible that not all locations have fully updated to v2.5 yet and due to your geographical locations you may both be getting a mixture of files from the cloud and your own browser cache which is causing the problems.

When I mentioned the last post, I meant this thread, your post where you quote mpiotte, including one in the quote and 2 in the "Am I missing something..." sentence. I can't comment on the links as I haven't completed either of the relevant problems.

euler wrote:Which thread are you both referring to? All the posts in thread 479 and 478 are viewing fine for me in all browsers: Firefox, Chrome, and IE11, with the exception of formulae in asgerix's posts because he is using those double underscores in the limits of the summation; they are just appearing in black boxes un-rendered...

The rendering on the main site works correctly for me on both Firefox and IE. I see errors in this thread using IE but not Firefox.

Thank you for your replies. The "problem" is obviously caused by the new MathJax version 2.5. I realize that using two subscripts is perhaps not the correct way to achieve the effect I want. A better way is perhaps to use \substack{ i=0 \\ i \le n }:$$\sum_{\substack{i = 0 \\ i \le n}}i$$Now I just have to go through all my posts to replace the faulty expressions.

By the way: I'm pretty sure that I'm not the only one using the double subscript method; I think I originally copied if from someone else's post in one of the private forums.

Edit: Going through my posts, I found another problem which is apparently caused by the new MathJax. The first parenthesis in some binomial coefficients is smaller than the second! One example here: https://projecteuler.net/thread=498#193203

The LaTeX code: [\]begin{eqnarray} C & = & {n \choose k} \\ [\]end{eqnarray} (backslashes enclosed in brackets to avoid LaTeX rendering) gives:
$$\begin{eqnarray}
C & = & {n \choose k} \\
\end{eqnarray}$$For me, the above binomial coefficient renders with different sized parenthesises.

Thanks,
Asger

jaap wrote:BTW, it is very odd. At work asgerix's post rendered fine for me, but now at home its formula does not render at all, even though I am using the same browser (Firefox 35.0.1). The only difference is that at work it's 64-bit, at home 32-bit.

To follow up on this: At work today it asgerix's first post rendered as he intended at first, but after forcing full reload (ctrl-F5) it no longer renders. I think that indeed proves that it is the MathJax update that caused this change.

I was just awarded a "High Five" for solving the five most recent problems. However, I have only solved problems 500, 501, 503 and 504. Any idea what happened there?

I think the new 'recent' system may have caused an error in the 'high five' award. I just solved problem 504 and got the message:

Congratulations, the answer you gave to problem 504 is correct.
...
You have earned 1 new award:

High Five: Solve the five most recent problems

Sadly, I have not solved the last 5 problems (neither 501 nor 502). As to what the origin of the bug is, I should note that I have solved exactly five of the ten 'recent' problems, but unless the award is to be reworded, or I misunderstood it, I have not met the conditions for it

Edit: Just noticed dev_random posted about the same thing, a minute before I did.

I am here because of the same reason.
The last 5 problems, I solved, are: 485,491,493,500,504.
Seems, that we all solved 500 and 504.

Thank you for letting me know. It was a bug and should be fixed now. However, unlike most of the other awards, which are re-checked each time you visit the Progress page or solve a problem, High Five is one of the "permanent" awards. This means it will remain. It's entirely up to you, but if you want me to remove it for you then just send me a PM.

My browser (Chrome / OS X) shows 3 copies of all the math on https://projecteuler.net/problem=505

I had this too (also on Chrome, and not just with problem 505 but with anything with LaTeX), but when I checked right now on problem 505 I got the following:

Let:

[Math Processing Error]
You are given:

[Math Processing Error]
Find [Math Processing Error].

Any idea why this might happen?

I'm still seeing math processing error all over this forum. For example, the quoted text of the last post reads for me as follows:

Let:

[Math Processing Error]
You are given:

[Math Processing Error]
Find [Math Processing Error].

mdean wrote:I'm still seeing math processing error all over this forum. For example, the quoted text of the last post reads for me as follows:

Let:

[Math Processing Error]
You are given:

[Math Processing Error]
Find [Math Processing Error].

It may be that your browser is using a cached out of date version of the jsmath library. Try pressing Ctrl-F5, as in most browsers this forces a reload of the page and all its associated files.

jaap wrote: It may be that your browser is using a cached out of date version of the jsmath library. Try pressing Ctrl-F5, as in most browsers this forces a reload of the page and all its associated files.

No good. I still see them in Pimspelier's post. I've recently updated to IE 11, though I first noticed the issue on IE 10.

mdean wrote:

jaap wrote: It may be that your browser is using a cached out of date version of the jsmath library. Try pressing Ctrl-F5, as in most browsers this forces a reload of the page and all its associated files.

No good. I still see them in Pimspelier's post. I've recently updated to IE 11, though I first noticed the issue on IE 10.

Actually, Pimspelier's post does not contain rendered maths, only the error message he got, and so will show red text in all browsers. Do you still have the problem on any post that actually does contain maths formulae?

jaap wrote: Actually, Pimspelier's post does not contain rendered maths, only the error message he got, and so will show red text in all browsers. Do you still have the problem on any post that actually does contain maths formulae?

I still see it all over page 14. I had commented on it before. Not much had become of it.

Now for me, it looks again like jpaulson said: triple LaTeX, everywhere.
Indeed, as Jaap said, the text I quoted was just [Math Processing Error] colored red, not LaTeX.