Incidence not known: 1  Abdominal or stomach pain. 2  bloating. 3  blurred vision. 4  change in vaginal discharge. 5  clay-colored stools. 6  cleft lip or palate. 7  confusion. 8  constipation. 9  darkened urine. 10  diarrhea. 11  difficult or labored breathing. 12  difficulty with swallowing. 13  difficulty with walking. 14  dizziness.
In abstract algebra, a normal subgroup is a subgroup which is invariant under conjugation by members of the group of which it is a part. In other words, a subgroup H of a group G is normal in G if and only if gH = Hg for all g in G, i.e., the sets of left and right cosets coincide.Normal subgroups (and only normal subgroups) can be used to construct quotient groups from a given group.n other words, a subgroup H of a group G is normal in G if and only if gH = Hg for all g in G, i.e., the sets of left and right cosets coincide.
Since $H h = h H$ for any $h\in H$ we see that $H$ commutes with every element of $G$ and hence is normal. Example: In the dihedral group $D_{2n}: \{ a, c | a^n = c^2 = (a c)^2 = 1 \}$ the cyclic subgroup $\langle a \rangle$ is normal.Example: The alternating group $A_n$ is normal in $S_n$.ince $H h = h H$ for any $h\in H$ we see that $H$ commutes with every element of $G$ and hence is normal. Example: In the dihedral group $D_{2n}: \{ a, c | a^n = c^2 = (a c)^2 = 1 \}$ the cyclic subgroup $\langle a \rangle$ is normal.