Obtuse can be right!

My daughter, whose creative exploits have been featured here before (for instance see her design for a math-music game), now has a blog, titled Uniquely Mine. I...

Visual proofs

I just came across these lovely visual mathematical proofs. For instance consider the following sequence: 1/2 + 1/4 + 1/8 + 1/16 + … = 1 and then see the ...