Basic Mathematics by Serge Lang - 6.4 Inverse of Isometries (Basic Mathematics)

Can we compose any isometry to obtain the identity? Much like in addition and multiplication, you can. We won't prove that all isometries are invertible (see section 6.5 to do that for yourself), but we will expose how finding the inverse allows us to uniquely identify isometries, as well as exhaustively examine them. Support Real Physics by buying the book through this Amazon affiliate link: https://amzn.to/2I5yIHr Here's my Patreon account if you want to give me money: https://www.patreon.com/realphysics Other ways to support Real Physics: https://youtu.be/44nldGgJCiw Playlist: https://www.youtube.com/playlist?list=PLMcpDl1Pr-viA25VUkHNmcUkWx9usPgyb Thank you!