Proof

(related to Proposition: Criteria for Subgroups)

Proof for criterion $(1)$

"\(\Rightarrow\)"

"\(\Leftarrow\)"

Proof for criterion $(2)$


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References

Bibliography

  1. Modler, Florian; Kreh, Martin: "Tutorium Algebra", Springer Spektrum, 2013
  2. Kramer Jürg, von Pippich, Anna-Maria: "Von den natürlichen Zahlen zu den Quaternionen", Springer-Spektrum, 2013