disp('>> % 	SPANNING A TRIVECTOR');     % 	SPANNING A TRIVECTOR     GAfigure; clc; %/     disp('>> % 	SPANNING A TRIVECTOR');     % 	SPANNING A TRIVECTOR     disp('>> %');     %     global dummy; %/     clf; %/     disp('>> % 	We can also span a TRIVECTOR:');     % 	We can also span a TRIVECTOR:     fprintf(1,'\n');     fprintf(1,'>> e1^e2^e3  ');     input('');     e1^e2^e3 %w     disp('>> % I3  is called the PSEUDOSCALAR of 3-space ');     % I3  is called the PSEUDOSCALAR of 3-space      GAprompt; %/     disp('>> % 	Again, there is anti-symmetry:');     % 	Again, there is anti-symmetry:     fprintf(1,'\n');     fprintf(1,'>> e2^e1^e3  ');     input('');     e2^e1^e3 %w     GAprompt; %/     disp('>> % 	Here''s how we draw it:');     % 	Here's how we draw it:     disp('>> draw(I3);');     draw(I3);     GAtext(0.7*e1+0.2*e3,'I3'); %/