HP Prime Graphing Calculator - Manual (Page 388)

382 Functions and commands
algvar Returns the matrix of the symbolic variable names used in an
expression. The list is ordered by the algebraic extensions
required to build the original expression.
algvar(Expr)
Example:
algvar(sqrt(x)+y)
gives
AND Logical And. Returns 1 if the left and right sides both evaluate
to true and returns 0 otherwise.
Expr1 AND Expr2
Example:
3 +1==4 AND 4 < 5 returns 1
append Appends an element to a list or vector.
append((List, Element)
or
append(Vector, Element)
Example:
append([1,2,3],4) gives [1,2,3,4]
apply Returns a vector containing the results of applying a function
to the elements in a list.
apply(Var→f(Var), List)
Example:
apply(x→x^3,[1,2,3])
gives
[1,8,27]
assume Used in programming to state an assumption about a
variable.
assume(Var,Expr)
Example:
assume(n, integer)
y
x