2. Sequence 전자공학이론/이산수학2015. 10. 16. 15:30
는 Definition을 나타내고, 는 Theorem을 나타낸다.
ordered pair
we call (x, y) on ordered pair.
(x1, x2)=(y1, y2) if and only if x1=y1, and x2=y2.
cartesian product
X x Y = { (x, y) | x∈X and y∈Y}
sequence
A sequence is an ordered list.
S or {Sn} is a sequence named S, the entire sequence.
Sn is single element of the sequence S at index n.
sub-sequence
A sub-sequence {Snk} is a sequence that consist of certain element of {Sn} retained in the original order in S.
string
A string over a set X is a finite sequence of elements from X.
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