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/* Original version of this file copyright 1999 by Michael Wester,
* and retrieved from http://www.math.unm.edu/~wester/demos/Products/problems.macsyma
* circa 2006-10-23.
*
* Released under the terms of the GNU General Public License, version 2,
* per message dated 2007-06-03 from Michael Wester to Robert Dodier
* (contained in the file wester-gpl-permission-message.txt).
*
* See: "A Critique of the Mathematical Abilities of CA Systems"
* by Michael Wester, pp 25--60 in
* "Computer Algebra Systems: A Practical Guide", edited by Michael J. Wester
* and published by John Wiley and Sons, Chichester, United Kingdom, 1999.
*/
/* ----------[ M a c s y m a ]---------- */
/* ---------- Initialization ---------- */
showtime: all$
prederror: false$
/* ---------- Products ---------- */
/* => [640 pi^3]/[2187 sqrt(3)] [Gradshteyn and Ryzhik 8.338(5)] */
closedform(product(gamma(k/3), k, 1, 8));
/* => n! = gamma(n + 1) */
product(k, k, 1, n);
/* => x^[n (n + 1)/2] */
closedform(product(x^k, k, 1, n));
/* => n */
closedform(product((1 + 1/k), k, 1, n - 1));
/* => 1/2^(2 n) binomial(2 n, n) [Knopp, p. 385] */
closedform(product((2*k - 1)/(2*k), k, 1, n));
/* => [x^(2 n) - 1]/(x^2 - 1) [Gradshteyn and Ryzhik 1.396(1)] */
'product(x^2 - 2*x*cos(k*%pi/n) + 1, k, 1, n - 1);
closedform(%);
/* => 2/3 [Knopp, p. 228] */
closedform(product((k^3 - 1)/(k^3 + 1), k, 2, inf));
/* => 2/pi [Gradshteyn and Ryzhik 0.262(2)] */
closedform(product(1 - 1/(2*k)^2, k, 1, inf));
/* => sqrt(2) [Gradshteyn and Ryzhik 0.261] */
'product(1 + (-1)^(k + 1)/(2*k - 1), k, 1, inf);
closedform(%);
/* => -1 [Knopp, p. 436] */
'product((k*(k + 1) + 1 + %i)/(k*(k + 1) + 1 - %i), k, 0, inf);
closedform(%);
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