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--- title: "SU-MATH109 SEP292023" source: https://www.jemoka.com/posts/kbhsu_math109_sep292023/ date: 2023-09-29 --- Key Sequence New Definitions modular arithmetic + basic modular arithmetic operations permutation groups left cancellation, right cancellation Results and Their Proofs Chinese Remainder Theorem Questions for Jana why is it that adding all the digits work for \(\ \text{mod}\ 9\). I still don’t get it. in re Chinese Remainder Theorem: is there any case in which \(a\ \text{mod}\ b\) is not unique? Interesting Factoids