# Maple - Explicit Set Definition & Natural Number Symbol

1. Oct 31, 2016

### f47box

Hi,

I would like to know if is possible define a set rule explicitly.

ex.:
Define the set A explicitly where ξ = ℕ and A = {x | x < 3}.
The maplesoft said the (N) is a representation of Natural Numbers.

f:=proc()
local a,b;
a:=N;
b:= 3;
print(a<b);

end proc;

when I called a function f() the result is N < 3

How can I do to print the real numbers defined above? Is it possible define a set rule like above (like showed in books)?

Other exemple that I´m trying to get a boolean result is:

f:=proc()
local a,b;
a:=N;
b:= 3;
b in a;
end proc;

when I called a function f() the result is b ∈ a (I expect "true" or "false").

2. Nov 5, 2016