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=== Multi-event segment ===
A ''multi-event segment''
<math>(z_1,t_1,z_1)(z_2,t_2,z_2) \cdots (z_n,t_n,z_n)</math> over an event set <math> Z </math> and a time interval <math>[t_l, t_u] \subset \mathbb{T} </math> is concatenation of [[Event Segment#Unit event segment|unit event segments]] <math>\epsilon_{[t_l,t_1]},(z_1,t_1,z_1), \epsilon_{[t_1,t_2]},(z_2,t_2,z_2),\ldots, (z_n,t_n,z_n),</math> and <math>\epsilon_{[t_n,t_u]}</math> where
<math>t_l\le t_1 \le t_2 \le \cdots \le t_{n-1} \le t_n \le t_u</math>.
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