internal string ToHtml()
{
if (IsInfinityInterval)
{
if (WichSide)
{
return($"(-∞ {Border.ToHTML()}{(BorderIsIncluded ? "]" : ")")}");
}
else
{
return($"{(BorderIsIncluded ? "[" : "(")}{Border.ToHTML()} +∞)");
}
}
else
{
if (LeftBorder.Equals(RightBorder) && LeftIsIncluded && RightIsIncluded)
{
return($"{{{LeftBorder.ToHTML()}}}");
}
else
{
return($"{(LeftIsIncluded ? "[" : "(")}{LeftBorder.ToHTML()} {RightBorder.ToHTML()}{(RightIsIncluded ? "]" : ")")}");
}
}
}