D.8.8.1 bounds

Usage:

bounds(a); a number;
bounds(a, b); a, b number;

Return:

interval: if size(#)==0 it returns the interval [a, a], else the interval [a,#[1]]

LIB "rootisolation.lib";
ring R = 0,x,dp;
interval I = bounds(1);
I;
==> [1, 1]
interval J = bounds(2/3,3);
J;
==> [2/3, 3]