group of fouurth root of unity is isomorphic to Permutation Group|Cayley's theorem|group theory

definition of even and odd permutation,inversion:    • even|odd permutation|inversion|definition|...   definition of cyclic permutation, transportation, length of cycle:    • cyclic Permutation|transposition|disjoint ...   definition of permutation group:    • defination of permutation|group theory|B.S...   Sn forms a group w.r.t. the composite of mapping:    • Permutation Group|Sn is non abelian group|...   Fourth root of unity forms a group w.r.t multiplication:    • Set of Fourth root of unity forms an abeli...   defination of group:    • Example to prove a non empty set is a grou...   lectures on Group theory:    • Lectures on group theory   Lectures on Discrete Mathematics:    • Lectures on Discrete Mathematics   Group theory is very important part of pure mathematics. It will ask you almost every exam such as CSIR NET, JAM, GATE MA, NBHM, UPSC optional, M.Sc. Entrance, PhD entrance, M.Sc. , B.Sc, BCA, and many more so do subscribe my channel for further understanding on the topic , give 👍 and don't forget to press 🔔 thanku