Review Math is no prob-llama t-shirt

Maths hones your skills of logical deduction and strategic thinking. This coin puzzle requires both. Take six identical coins and arrange them in two rows. The challenge is to rearrange them into a hexagon in three moves. In Math is no prob-llama t-shirt, a coin must be slid into a position where it is touching two other coins. You are not allowed to lift the coin off the table, nor slide it over another coin, nor move other coins out of the way.
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When I was a kid, my mom was getting her hands on my summer reading list. I am not a kid anymore, but I still have same need. For Math is no prob-llama t-shirt, I have just combined the list of some articles about mathematics which I am going to read this summer. All the articles below I am interested in mathematics.