Divisibility |Part 4| Relative Primes, Euclid's Lemma 

This video is about the concept of relative primes (or relative prime integers a and b). I further explain some basic consequences, such as 1=ax+by for some x, y integers. And we also prove Euclid's Lemma.
Divisibility |Part 1|: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-oGQiQQ2ie7k.html
Divisibility |Part 2|: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-EC7A0nU4kgA.html
Divisibility |Part 3|: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-_agxMnKikxk.html