Normal Subgroup | Properties and Examples| Group theory

If G is a group and H is a subgroup of index 2 in G. Show that H is a normal subgroup of G

Normal Subgroup | Lagrange's Theorem | Examples | Discrete Mathematics |

Group Theory| Subgroup| Theorem On Subgroup and Its proof| One Step Test| Theta Classes

Normal Subgroups || Theorems and Example || Group Theory

Normal subgroup in group theory | Theorem proof | Group | discrete mathematics in hindi

Intensive Extensive Properites

GT3. Cosets and Lagrange's Theorem