On BrainPickings I came across a review of an absolutely stunning version of Euclid’s Elements. Produced in 1847 by mathematician Oliver Byrne, the book is obsessively visual like the proof below of the Pythagorean Theorem. I would love to find a poster for my office. Sadly Google came up empty. I did happen to find another 2010 review in the NY Times. You can also buy the book on Amazon. Maybe a holiday present for that geek in your life?
Stick this in your feed reader and love it. I just found an awesome Tumblr called Visualizing Math that collects all manner of math visualizations from all over the web. I especially the gifs like the above example (might need to click on it to see).
I get sent math jokes all the time. Just check my FB wall. I feel like I’ve seen them all. This was new to me though. Kinda sweet and funny? Thanks, Sue, for sending it my way.
I remember taking a Philosophy of Math class as an undergrad, and it was the first time I ran into the question, is math real? Or maybe a more nuanced way of putting it is, what kind of reality does it have? This video surveys the most popular theories. Warning, in case you have a lot to do today, you can wonder about this one a long time.
There is a new PBS math channel on YouTube I learned about from Free Tech for Teachers. The content level is pretty basic, but it could be a nice review for students. I know a number of my algebra students still struggle with integer operations. I especially like the quiz video above. Very clever use of a YouTube video. The production quality, being PBS, is also a bit higher than a lot of the math videos around.
Here is a way to factor trinomials that I’d never seen before. It came my way via the tutoring center. I’m working on a proof, but it seems really convincing. Check it out. It is a lot easier than the reverse foil or AC-methods. Does anyone know who came up with it?