Difficult: For some reason, it always throws me off that g ∘ f is g(f(x)), since I always think that the letter that comes first should be the function we do first, so that kept throwing me off but I think I've got it figured out now.
Also, it started talking about how ran A only needed to be a subset of B' for (g∘ f):A--> C to be defined. Well B' does NOT mean the derivative of B, correct? Because that would be MEGA confusing.
Interesting: At first, this concept was totally tricky. However, it made a lot more sense with the nice picture with circles and arrows, along with the examples of finite sets. I also never knew that composition could be associative, yet not commutative. I thought that was fancy!
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