The problem is that a user copied parts from Tim Gowers' page at Cambridge University, and posted those as questions, without attribution.
Since the questions already have attracted a number of answers, straight deletion of the plagiarised content is not without its problems either. I have locked both questions until a decision how to resolve the situation is reached. Now is not the optimal time of the year for a speedy discussion, so the locked state lasts a bit longer than I hoped it would.
After discussing the matter with a CM, I've edited the questions to provide proper attribution and links to Tim Gowers' pages and unlocked them. Further improvements to the wording of the questions would not be unwelcome.