SVM equation from Slides

[udaykamath]

Prof Yaser.
Even though its not related to book chapter but the slide but thought it made sense here in this discussion.

In SVM slides Lecture 14

On page 13 we had just converted the problem to minimization and had

minimize Lagrangian(alpha)=....

On page 14 we have

maximize Lagrangian w.r.t alpha subject to...

How did this change?

Also page 15

we convert the maximize problem to minimize problem by inverting the sign.

So the jump from first minimize to maximize of lagrangian is not clear.

Thanks
Uday Kamath