07 May 2009 @ 11:50 pm
The 52nd Carnival of Mathematics is up and it's a good one.
17 January 2009 @ 02:39 pm
I haven't been paying so much attention to the carnival of mathematics lately, so I've skipped some issues — it seems we're already up to Number 47 (the Star Trek edition).

Two of the entries caught my attention. First, the incenter is the Nagel point of the medial triangle. This was known (and there are many similar ways of deriving one triangle center as a different center of a related triangle) but The Advanced High School Math Project supplies a proof.

And second, Quomodocumque gets into some deep water attempting to count the order-types of planar point sets.
25 July 2008 @ 02:44 pm
It's carnival time again! The 37th Carnival of Mathematics is now up at Logic Nest. They're taking additional submissions through Sunday evening, too, so if you missed out on getting your post included you still have time, and if you already read the Carnival you should check back for more math.
16 May 2008 @ 01:05 pm
Here's a cute little geometric factoid that has something to do with one of the posts over at the 33rd Carnival of Mathematics. I'll leave it as a puzzle which post it belongs to...

Let ABC be any triangle in the Euclidean plane, and AD be any line. Form points A', B', and C' as the perpendicular projections of A onto BC, B onto AD, and C onto AD respectively. Then triangles ABC and A'B'C' are similar.

diagramCollapse )

(Hint: in the post I have in mind, ABC is isosceles and A' is the midpoint of BC.)
18 April 2008 @ 04:16 pm
Jeff Shallit takes his turn at posting Carnival of Mathematics #31.
04 April 2008 @ 01:48 pm
30th Carnival of Mathematics, now up at The Number Warrior.
14 December 2007 @ 11:59 am
22nd Carnival of Mathematics, from Wild About Math!
01 December 2007 @ 01:05 pm
Carnival of mathematics #21: bar-hopping at last. From the not-so-secret-anymore blogging seminar.
19 October 2007 @ 10:33 am
19th Carnival of Spam Mathematics, from Good Math, Bad Math. Baseball, personal finance, romance, and personal improvement. Or maybe, statistics, number theory, algebra, and math education.
06 October 2007 @ 12:05 pm
Carnival of Mathematics 18, from JD2718. He seems to have made quite an effort to dig up relevant posts: as he says, "it's kind of big..."
21 September 2007 @ 11:12 pm
Seventeenth Carnival of Mathematics, now up at MathNotations.
08 September 2007 @ 07:18 pm
The 16th Carnival of Mathematics is now up at Learning Computation. From it we learn that secondary-school mathematics is good, research mathematics is bad, and computer science is ugly. Well, but there are significantly more research math (and vaguely computational research math) links than the previous few of these, so that's good.
15 June 2007 @ 03:14 pm
Math Carnival 10. With a bit of side discussion over whether it's appropriate to continue lumping elementary and advanced math together, or whether any split should wait until there's enough more volume.
02 June 2007 @ 03:29 pm
Carnival of Mathematics IX: this time it's alphabetical.
18 May 2007 @ 11:32 pm
The eighth Carnival of Mathematics, now up on Suresh's geomblog.
06 April 2007 @ 05:01 pm
Fifth Carnival of Mathematics, now up at Science and Reason. More focused on recent mathematical news (Paul Cohen, medieval islamic Penrose tiles, and E8) and less on a catch-all of popular math blog posts than previous carnivals, but it still has some of the latter type of posts as well.