Answer to Question #327588 in Functional Analysis for Gob

Question

x=R^n

x=(x1,x2,x3,x4,....,xn).

y=(y1,y2,y3,y4,....,yn)

d(x,y)=√((x1-y1)^2+(x2-y2)^2+(x3-y3)^2+......+(xn-yn)^2)

Show that d is metric on x