Homework: Reading questions

Submit two items to the submission website (see link in the navigation bar at the top of the page):

Submit your own question about the paper (e.g., what you find most confusing about the paper or the paper's general context/problem), before lecture (i.e., 1pm). You cannot use the question below. To the extent possible, during lecture we will try to answer questions submitted beforehand.
Submit your answer for the question below, before the beginning of the lecture.

Answer the following question:

Yggdrasil has low proof effort because it has cleverly designed abstractions that Z3 can proof correct. But, there are properties of a file system that the Yggdrasil authors cannot model and prove because they rely on Z3. Give one example and explain why.

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