if a sequence Y_n is bounded then there is sub sequence Y_r_n which satisfies lim inf Y_n<=lim Y_r_n as n->+infinity i didnt here of that definition before the only definition i know about liminf is that it the supremum of all the infimums of the sequence using the definition i know this onedoesnt make any sense ??Code:lim inf Y_n<=lim Y_r_n as n->+infinity