Page 354 - Schaum's Outline of Differential Equations

APPENDIX B 337

TI-89
The TI-89 Symbolic Manipulation is manufactured by Texas Instruments Incorporated
(http://www.ti.com/calc). It is hand-held, measuring approximately 7 inches by 3.5 inches, with a depth of
nearly an inch. The display screen measures approximately 2.5 inches by 1.5 inches. The TI-89 is powered by
four AAA batteries.
Regarding differential equations, the TI-89 can do the following:

• Graph slope fields to first-order equations;

• Transform higher-order equations into a system of first-order equations;
• Runge-Kutta and Euler numerical methods;
• Symbolically solve many types of first-order equations;
• Symbolically solve many types of second-order equations.

MATHEMATICA
There are many versions of MATHEMATICA, such as 5.0, 5.1, etc. MATHEMATICA is manufactured by
Wolfram Research, Inc. (http://www.wolfram.com/). With this package, the user "interacts" with the computer
algebra system.
MATHEMATICA is extremely robust. It has the ability to do everything the TI-89 can do. Among its many
other capabilities, it has a library of classical functions (e.g. the Hermite polynomials, the Laguerre polynomials,
etc.), solves linear difference equations and its graphics powerfully illustrate both curves and surfaces.