Hi, I'm Sehee Lim who is attending UC Berkeley as an exchange student this semester. I'm from Korean and I study statistics and data science. Nice to meet you all!

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1. Natural Numbers

opperations allowed for natural numbers: +, ×

2. Integers

opperations allowed for integers: +, -, ×

3. Rational Numbers

opperations allowed for rational numbers: +, -, ×, /

HW1: https://courses.wikinana.org/_media/math104-s22/s/sehee_lim/adobe_scan_2022%EB%85%84_1%EC%9B%94_26%EC%9D%BC.pdf