/// <summary>
/// Multiplies this <see cref="POS"/> by <paramref name="expression"/>
/// </summary>
/// <param name="expression"></param>
/// <returns></returns>
public IExpression Multiply(IExpression expression)
{
// If the other expression as a POS
if (expression is POS product)
{
// Check if the powers match
return(new POS(Power == product.Power?
// If so, just concat lists of factors
Factors.Concat(product.Factors) :
// Otherwise invert the second expression
Factors.Concat(product.Factors.Select((x) => x.Reciprocal())), Power));
}
// If it's not simply create a new POS based on it and multiply it by the current instance
else
{
return(Multiply(new POS(expression)));
}
}
