static public void WriteIsInvolution(int[] permutation)
{
int[][] cyclePermutation = WithoutRepetition.PermutationToCycle(permutation);
using (StreamWriter writer = new StreamWriter("log.txt", true))
{
WriteDate(writer);
WriteLine(writer, "If permutation is an involution:");
WriteLine(writer);
Write(writer, "One-line notation: ");
WriteVector(writer, permutation);
WriteLine(writer);
Write(writer, "Canonical cycle notation: ");
WriteCycle(writer, cyclePermutation);
WriteLine(writer);
WriteLine(writer);
Write(writer, "Is an involution? - ");
if (WithoutRepetition.IsInvolution(permutation))
{
Write(writer, "yes");
}
else
{
Write(writer, "no");
}
WriteLine(writer);
}
}