## 3068 Reputation

19 years, 328 days

Doug

`---------------------------------------------------------------------Douglas B. Meade  <><Math, USC, Columbia, SC 29208  E-mail: mailto:meade@math.sc.eduPhone:  (803) 777-6183         URL:    http://www.math.sc.edu`

## Embedded components, maplets, and sudoku...

Maple

My oldest son, Stuart, recently completed a Science Fair project on sudoku puzzles. While I am fairly good at solving sudoku puzzles, the mathematics is something that is completely outside my area of expertise. After seeing the paper by Hurzberg and Murty in the Notices of the AMS (June/July 2007) and additional papers by Felgenhauer and Jarvis (http://www.afjarvis.staff.shef.ac.uk/maths/felgenhauer_jarvis_spec1.pdf)  and Russell and Jarvis (http://www.afjarvis.staff.shef.ac.uk/maths/russell_jarvis_spec2.pdf) and Jarvis' sudoku webpage (http://www.afjarvis.staff.shef.ac.uk/sudoku/), I felt that I had a reasonable understanding of some of the basic ideas involved in counting unique sudoku puzzles. While I had nothing to add to the mathematical ideas, I did see the potential to create a tool to visualize these ideas. The result is the worksheet I just uploaded to MaplePrimes:

## Interesting Improper Integrals...

A colleague showed this to me earlier this afternoon. I can explain, and accept, most of Maple's responses. I do have one case where I believe Maple could do better.

This arose during the creation of some Maple materials to support the derivation of the Integral Test for series convergence. Consider:

```restart;
I1 := Int( 1/x^p, x=1..infinity );
/infinity
|          1
|          -- dx
|           p
/1          x
```

I have been trying to change the signature on the account settings on MaplePrimes. I did make a change in the last couple of weeks, but need to make another change to remove some extraneous characters from the end of the signature. I have gone through the steps to make this change several times (at least 10) in the last couple of days, from work and home. But, the change is never saved. I make the change to the signature, click Submit, and see a message that "The changes have been saved." But, when I try to make another post, the changes have NOT been saved. I have tried entering my password as part of this process, but that makes no difference. I have tried to re-click the Accept box for the Terms and Conditions but this box is inactive.

## Quick Reference Document...

For the past decade Doug Meade, at the University of South Carolina, has created and maintained a two-page document with essential Maple commands. The first version was created for Maple V, Release 4, in January 1998. n update has been created for each version of Maple (except Maple 10) as it was released. The document has become pretty stable - hence the omission for Maple 10. Here are links to the complete set of documents he has created