For The Love of Cycling — ℤₙ* The Multiplicative group for ℤₙ modulo n
Published in
5 min readAug 29, 2018
Okay … let me ask you. For the numbers up to 10, which numbers do not share any factors with 10? Remember that 10 has factors of 2 and 5, so you can’t use any number which have any of these factors.
Let’s try … 1 … that’s okay.
Let’s try … 2 … nope! It is 2 ｘ1. Reject!
Let’s try … 3 … that’s okay.
Let’s try … 4 .. nope. It is 2 ｘ2. Reject…
