public override bool Equals(object obj)
{
return(obj != null && obj.ToString() == ToString() && obj is Add add &&
ContainedVariables.SetEquals(add.ContainedVariables) && Arguments.SequenceEqual(add.Arguments));
}
public override bool Equals(object obj)
{
return(obj != null && obj.ToString() == ToString() && obj is Multiply mul &&
ContainedVariables.SetEquals(mul.ContainedVariables) && Arguments.SequenceEqual(mul.Arguments));
}