16.1, due on November 30

• The hardest thing to understand about this section was the "infinity" concept. I understand where they're saying infinity is on the graph, but I'm having trouble understanding the addition with infinity. Its really close, but not quite. Lecture should help clear this one up. I also wasn't sure what "abelian group" meant. I learned it in 371 last year, but I can't remember what an abelian group is...
  
• This section of reading really reminded me of differential equations. They took implicit derivatives, they found the slope of the tangent line to a curve, and so on. I also really liked that they clarified the origin of an elliptic curve. At first, I thought it had something to do with ellipses, which it does. But it didn't deal directly with ellipses like I originally thought.