FUNDAMENTALS
This Appendix presents the fundamental symbols, definitions, and facts needed to pursue the essence of the theory of Fibonacci and Lucas numbers. For convenience, we have omitted examples and all proofs [369].
SEQUENCES
The sequence 
is denoted by 
or simply 
when there is no possibility of confusion. The 
th term 
is the general term of the sequence. Sequences can be classified as finite or infinite, as the next definition shows.
A sequence is finite if its domain is finite; otherwise, it is infinite.
SUMMATION AND PRODUCT NOTATIONS
The variable 
is the summation index. The values and are the lower and upper limits of the index . The “” above the is often omitted; in ...
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