File: vector.dem

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/* *****  This DEMO appears to be broken.  Please use the VECT 
package on the SHARE directory. - JPG 6/5/78  ***** */

/* First, we establish p, q, f, and g as vector entities: */
DECLARE([p, q, f, g], NONSCALAR);
/* To attempt to prove the following vector identity: */
p cross q dotdel f cross g + q cross f dotdel p cross g +
	f cross p dotdel q cross g = 0;
/* Now determine the expansion of: */
laplacian %PI*(s+h) = div 3*s*p;