12-240/Classnotes for Thursday September 20

In this class, the professor completes the lecture about complex number and then introduces vector space.

Complex number

Definition:

C={(a,b): a, b $\in \!\,$ R}

1 ( of C) = (1,0); 0 ( of C)= (0,0)

i=(0,1) File:IMG.jpg File:IMG2.jpg File:IMG3.jpg