/// <summary>
/// Returns true if the formula can be added to a <see cref="FormulaCache" /> otherwise false
/// </summary>
public static bool IsCachable(this IFormula formula)
{
return(formula.IsExplicit() ||
formula.IsBlackBox() ||
formula.IsDynamic() ||
formula.IsTable() ||
formula.IsTableWithOffSet() ||
formula.IsTableWithXArgument());
}