If i made a predicate to check if numbers a and b are both 2, i'd name it both-two? define in the sense of LISP, this means to formally tell the script what you want a given symbol to evaluate to. We often refer to functions which return #t or #f as predicates, and in SWC-LISP, the convention is to name those functions ending with a question mark. It is an s-expression, but more than that it is a value, number, boolean Boolean is a data type that can be either True or False. We use the same kind of notation and terms to discuss lists.Ītom a single 'thing' - the smallest unit thing in LISP. 2 is the second thing, and all the way at the end, the term n representing the last thing in that sequence is the 'nth' thing.

When referring to any specific 'thing' in that sequence, we talk about its position.

n, where the first couple things give you an idea of how the sequence goes (in this case incrementing by 1), the ellipses (.) indicate it continues. Notation for a sequence of things is often 1 2.

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