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D.15.30.1 bounds

Procedure from library rootisolation.lib (see rootisolation_lib).

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]]

Example:
 
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]