Message regarding the confusion I had in today's lecture

In today's lecture I spotted a mistake in my notes on the "more technical take on the Envelope Theorem in Kuhn Tucker problems". The mistake undermined the proof I was going through so I told everyone to abandon it and wait for further message. 

I have now reviewed my notes and confirmed that it is wrong. However the correct proof is not that relevant for what we have been studying in this course, so you can all forget about it. Let's just stick to the simpler interpretation that was covered in the lecture. 

You Ola Wu