SU-MATH109 SEP292023

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