a: [1, 2, 3, 4];

b: [3, 0, -4, 2];

	a + b;

	3 * a;

a . b;

a + b;

sqrt(a . a);

draw2d(xrange = [0, 5], yrange = [0, 4], head_length = 0.25, vector([1, 1], [3, 2]))$

draw2d(xrange = [0,6], yrange = [0,4], head_length = 0.25, vector([0,0],[3,1]), vector([0,0],[2,2]), head_length = 0.00000001, color=green, line_type=dots, vector([3,1],[2,2]), vector([2,2],[3,1]), head_length = 0.25, line_type=solid, color=red, vector([0,0],[5,3]))$