DIFFICULT
The Onto functions in 9.3 are difficult for me to understand, and I think its because I am unclear of what the difference between codomain and range is. I don't understand what a Bijective Function is or what its difference is between an injective function is.
REFLECTIVE
Section 9.3 talks about one-to-one functions, which have been discussed in calculus. They are functions that pass the vertical and horizontal line tests.
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