- #1

- 9

- 2

- Homework Statement:
- This might be a silly question but im honestly confused. In this proof, how was it concluded that, from setting the derivative with respect to lambda and finding the critical point, there is a minima at that point?

- Relevant Equations:
- https://ibb.co/BnFGKwX

Im confused as finding the minimum value of lambda is an important part of the proof but it isn't clear to me that the critical point is a minimum