Sequences1, s2, ..., skis a subsequence of sequenceb1, b2, ..., bn, if there is such increasing sequence of indexesi1, i2, ..., ik(1 ≤ i1 < i2 < ... < ik ≤ n), that...
Sequence s1, s2, …, sk is a subsequence of sequence b1, b2, …, bn, if there is such increasing sequence of indexes i1, i2, …, ik (1 ≤ i1 < i2 < … < ik ≤ n), that ...
Sequences1, s2, ..., skis a subsequence of sequenceb1, b2, ..., bn, if there is such increasing sequence of indexesi1, i2, ..., ik(1 ≤ i1 < i2 < ... < ik ≤ n), that...