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YEN-JIE LEE: I think
chalkboard is much more

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natural for the
students and for me

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because if I write all the
equations on the slides, first

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of all, all those equations
appear at the same time.

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And so it is actually
harder for the student

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to follow the logic
between formulas.

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And my feeling is that
it is so much naturaler

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to see all those
equations popping up

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in a logical sequence for them.

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And by writing down
them on the chalkboard,

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people have time to
think as well, what

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is actually happening.

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And I have also the freedom to
point to the relevant equation

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on the board slowly so
that people, everybody

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who is not very familiar with
the mathematics can follow.

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Factorial x squared,
plus V triple prime 0

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divided by 3 factorial x to
the third, plus infinite number

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of times.

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And the V(0) is the position
of where you have minimum.

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So I think that's
actually a decision

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to use chalkboard in
combination with slides.

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Usually, my slides
contain information

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which is actually
already covered

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from the previous lecture.

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So that serves a purpose to
flash through the information

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which is actually
already covered

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duirng the last few lectures,
to remind people that, OK, you

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have learned this before.

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Right?

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And so I don't have
to waste a lot of time

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to copy them on the chalkboard
because they already

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learned that.

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And secondly, I can use slides
to include interesting figures,

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interesting videos, interesting
pictures, et cetera,

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so that it should be that is
complementary to my chalkboard

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teaching style.