The most difficult part to wrap my mind around is the way ordinary arithmetic might look when using modulos. It may be true that in Z(mod 5), 4+1=0 or 3x4=2 or 4+4=3 - usually when we see an equation set up like that, we intuitively assume that they are just regular integers and the equations just feel wrong!
Reflective:
It was definitely easy to recognize all the basic operations that could be performed on Z(mod n). It was also easy to follow the proofs the book presented for valid operations in Z(mod n). I found this chapter much easier to connect to previous chapters and theorems than any other section.
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