According to Pure Russellianism, if (1) David believes that Hesperus is a planetis true, (2) Phosphorus planet also true. It usually thought, by friends and foes of Russellianism alike, on it, when are (3) does not believe cannot but be false because this, many departed from Russellianism. In this paper, I will show relying the very explanation combined with account for sentences such as acknow...