EDB — 28M

Exercises

1. [28M] (Replaces 282)

   Let \(h≠ 0\), prove that if \(n× h= m× h\) then \(n= m\). (Sugg. use subtraction)

   Solution 1

   [28S]↺↻

   In particular the map \(n\mapsto n× h\) is injective.