Welcome to this week’s Math Munch!

Here’s something that sounds impossible: turn a single newspaper page into two rings, linked together, using only scissors and folding. No tape, no glue– just folding and a few little cuts.

Want to know how to do it? Check out this video by Mariano Tomatis:

On his website, Mariano calls himself the “Wonder Injector,” a “writer of science with the mission of the magician.” And that video certainly looked like magic! I wonder how the trick works…

Mariano’s website is full of fun videos involving mathe-magical tricks. I like watching them, being completely baffled, and then figuring out how the trick works. Here’s another one that I really like, about a fictional plane saved from crashing. It’s a little creepy.

How does this trick work???

Next up is one of my favorite number pattern — Pascal’s Triangle. Pascal’s Triangle appears all over mathematics– from algebra to combinatorics to number theory.

Pascal’s Triangle always starts with a 1 at the top. To make more rows, you add together two numbers next to each other and put their sum between them in the row below. For example, see the two threes beside each other in the fourth row? They add to 6, which is placed between them in the fifth row.

Pascal’s Triangle is full of interesting patterns (what can you find?)– but my favorite patterns appear when you color the numbers according to their factors.

That’s just what Brent Yorgey, computer programmer and author of the blog “The Math Less Travelled,” did! Here’s what you get if you color all of the numbers that are multiples of 2 gray and all of the numbers that aren’t multiples of 2 blue.

Recognize that pattern? It’s a Sierpinski triangle fractal!

If you thought that was cool, check out this one based on what happens if you divide all the numbers in the triangle by 5. The multiples of 5 are gray; the numbers that leave a remainder of 1 when divided by 5 are blue, remainder 2 are red, remainder 3 are yellow, and remainder 4 are green. And here’s one based on what happens if you divide all the numbers in the triangle by 6.

See the yellow Sierpinski triangle below the blue, red, green, and purple pattern? Why might the pattern for multiples of two appear in the triangle colored based on multiples of 6?

If you want to learn more about how Brent made these images and want to see more of them, check out his blog post, “Visualizing Pascal’s Triangle Remainders.”

Finally, I just stumbled across this collection of mathematical poems written by students at Arcadia University, in a class called “Mathematics in Literature.” They’re the result of a workshop led by mathematician and poet Sarah Glaz, who I met this summer at the Bridges Mathematical Art Conference. Sarah gave the students this prompt:

Step1: Brainstorm three recent school or other situations in your

present life – you can just write a few words to reference them.

Step 2: List 10-20 mathematical words you’ve used in class in the

past month.Step 3: Write about one of the previous situations using as many

of these words as possible. Try to avoid referencing the situation

directly. Write no more than seven words per line.

Here’s one that I like:

ASPARAGUS, by Sarah Goldfarb

An infinity of hunger within me

Dividing a bunch of green

Snap and sizzle,

Green parentheses in a pan

The aromatic property

Simplifying my want

Producing a need

Each fraction of a second

Dragging its feet impatiently as I wait

And when it is distributed on my plate

It is only a moment before zero

Units of nourishment remain.

Maybe you’ll try writing a poem of your own! If you do, we’d love to see it.

Bon appetit!

Actually we have already tried writing Maths poems a few years ago, in a European project. Here is our Fibonacci poems book (number of words according to Fibonacci series) about bread http://www.mixbook.com/photo-books/all/fibonacci-5228670. The theme of the project was Math and gastronomy. 🙂

Thanks for sharing! These are truly wonderful. I love how using the Fibonacci numbers makes the poems grow. I would love to try something similar in my class!

I was excited to try what they were doing in the video. It doesn’t work. I am assuming there is sleight of hand involved.

I agree. It looks like two identical sheets of newspaper are involved, but I’m not sure how the trick works.

I saw that, too, Scott, but I can’t figure out how to do it either. I’ve tried a bunch of things…

We have to think about the sleight of hand. I believe the result we think we see is impossible. I think there is tape involved (where one part is underneath), and at one point the paper we started with got exchanged with the specially prepared version.

I’ve been watching the video repeatedly to see if there’s an obvious place where the video is spliced. It’s really hard to tell. This is a very sneaky trick. I’d like to think it’s done without tape…

I concur. I thought at first glance that it was possible and tried it about half a dozen times. Upon actually thinking about it, I see no way that that could really work. It is not clear what he does, but it involves more than just folding cutting. It is a well-done magic trick.

How could it be? Isn’t there a way to describe the topology of before and after? I don’t think it makes sense to say the result came from flat sheets of paper.

Isn’t the plane video a clip from Lost without sound? I wonder how many different numbers it is possible to get. The whole thing is a little creepy though.

Haha, I think it is a clip from Lost. Definitely makes it creepier. As for how many different numbers you can get, try to get a good look at all of the numbers with the correct destination– that may help you answer your question! Thanks for the great comment!

can you creat other shapes other then an square?

Hi, Anthony! That’s a great question. Actually, I don’t think you can even make the square… I think the video is a little math prank. You should definitely try it, though! Maybe you’ll be able to figure it out. 🙂

I tried to make this, but it never worked out and i tried several times each one wasn’t like the one in the video. Therfore, I think this isn’t true and it’s a math prank.

so cool

Crazy how we can use math and science together to save planes from crashing! How are these simulations made using math?

Wow crazy how we can use math and science together to save planes from crashing! How are these simulations made?