Where is the postcard that X sent to Y in chap1 problem?

[jaeyoo]

[rmlarose]

It must be still in transit :) Thanks for catching this, we will update the problem set asap.

[jaeyoo]

Thank you @rmlarose. plus, I want to ask a tiny question. In chapter02.pdf, there is a sentence like would lead to operating effectively on 4-vectors as C^2 is equivalent to R^2. I think it meant C^2 is equivalent to R^4, right?

[rmlarose]

Yes that's right @jaeyoo I will fix this typo in chp 2 -- thanks!

We'll also get the missing figure uploaded to the chp 1 problem set soon.

[jaeyoo]

@rmlarose Thank you for clarification 👍