*(I remember a specific impressive example from 6 months ago: I asked if certain definitions could be relaxed to allow complex analysis on a non-orientable manifold, like a Klein bottle, something I spent a lot of time puzzling over, and an LLM instantly figured out it would make the Cauchy-Riemann equations globally inconsistent. (In a sense the arbitrary sign convention in CR defines an orientation on a manifold: reversing manifold orientation is the same as swapping i with -i. I understand this now, solely because an LLM suggested looking at it). Of course, I'm sure this isn't original LLM thinking—the math's certainly written down somewhere in its training material, in some highly specific postgraduate textbook I have no knowledge of. That's not relevant to me. For me, it's absolutely impossible to answer this type of question, where I have very little idea where to start, without either an LLM or a PhD-level domain specialist. There is no other tool that can make this kind of semantic-level search accessible to me. I'm very carefully thinking how best to make use of such an, incredibly powerful but alien, tool...)