Unique factorisation domains
Every element a product of irreducibles, in only one way up to order and units: the two halves of the definition, Gauss's lemma, and the ring where $6$ factors twice.
About 30 minutes7 activities Paper packet
Every element a product of irreducibles, in only one way up to order and units: the two halves of the definition, Gauss's lemma, and the ring where $6$ factors twice.
About 30 minutes7 activities Paper packet