11-02-2013, 10:05 PM

11-02-2013, 10:26 PM

Both the HP Prime and the TI nSpire produce correct answers. They just return slightly different representations of the same solution.

x>-2 AND x<1 means the same as -2<x<1

A or B or C is the same as A or (B or C).

11-02-2013, 10:49 PM

AS(x>-2 AND x<1) == (-2<x<1) Why -2<x<1 => 0 // BUG?

*Edited: 2 Nov 2013, 11:03 p.m. after one or more responses were posted*

11-02-2013, 11:00 PM

The inequality > and < have higher priority than AND. So

x>-2 AND x<1 is actually (x-2) AND (x<1) … not to be confused with x> (-2 and x) < 1 -- which would not make much sense.

Also, the result returns a symbolic object which embeds AND -- which is very different from a result which evaluates binary operation.