1
00:00:05,313 --> 00:00:07,530
YEN-JIE LEE: So
during class, I like

2
00:00:07,530 --> 00:00:11,490
to take a few minutes of break.

3
00:00:11,490 --> 00:00:15,100
So that will allow
the students to take

4
00:00:15,100 --> 00:00:18,910
some rest, because usually
the content is so intense,

5
00:00:18,910 --> 00:00:20,330
such that people--

6
00:00:20,330 --> 00:00:23,160
it takes some time
for the students

7
00:00:23,160 --> 00:00:25,950
to actually digest,
and then to understand,

8
00:00:25,950 --> 00:00:29,820
the concepts covered in the
first part of the lecture.

9
00:00:29,820 --> 00:00:31,740
And also, it give
them an opportunity

10
00:00:31,740 --> 00:00:33,250
to interact with me.

11
00:00:33,250 --> 00:00:35,070
And usually, during
the break, they

12
00:00:35,070 --> 00:00:40,350
bring a lot of questions, which
I didn't anticipate before.

13
00:00:40,350 --> 00:00:43,440
There are many, many
questions about mathematics

14
00:00:43,440 --> 00:00:44,730
and those of physics concepts.

15
00:00:44,730 --> 00:00:47,620
Here you have del
square e, right?

16
00:00:47,620 --> 00:00:51,770
And the del square, you have
1, 2, 3, turn, three operators.

17
00:00:51,770 --> 00:00:53,160
And while you are--

18
00:00:53,160 --> 00:00:56,160
if you write everything
explicitly-- so basically,

19
00:00:56,160 --> 00:01:00,220
this operator is going to be
operating on ex, ey, and zz.

20
00:01:00,220 --> 00:01:03,300
And then, we can usually
solve them during the class.

21
00:01:03,300 --> 00:01:07,710
And I can even cover part
of the question asked

22
00:01:07,710 --> 00:01:10,740
during the break, so
that everybody, actually,

23
00:01:10,740 --> 00:01:14,315
can benefit from those
interesting questions

24
00:01:14,315 --> 00:01:17,270
people actually bring
up during the break.