1 00:00:00,000 --> 00:00:04,200 Again, the bullets represent 2 
minute marks, approximately, 2 00:00:04,200 --> 00:00:04,733 3 00:00:04,733 --> 00:00:07,033 and this week we talked about complex numbers. 4 00:00:07,033 --> 00:00:10,000 We'll talk about why it's a field. So 
if you don't know what the word 5 00:00:10,000 --> 00:00:13,466 “field” means, I suggest checking 
out I believe Week 7 part 2. 6 00:00:13,466 --> 00:00:15,600 We talk about rings and fields there. 7 00:00:15,600 --> 00:00:16,833 8 00:00:16,833 --> 00:00:19,866 The complex numbers are an 
example of a ring and also of a field, 9 00:00:19,866 --> 00:00:21,466 something we will mention. 10 00:00:21,466 --> 00:00:23,000 We talked about a couple of operations: 11 00:00:23,000 --> 00:00:26,066 complex conjugation, properties of modulus. 12 00:00:26,066 --> 00:00:26,966 13 00:00:26,966 --> 00:00:29,200 We talked about polar coordinates, 
and we'll talk about converting 14 00:00:29,200 --> 00:00:31,433 from standard to polar form 15 00:00:31,433 --> 00:00:33,500 and from polar to standard form. 16 00:00:33,500 --> 00:00:34,233 17 00:00:34,233 --> 00:00:37,400 Actually we'll talk about polar to standard form next week I think. 18 00:00:37,400 --> 00:00:37,466