Looking at this wiki page, it seems most NP-complete problems are based on discrete structures, such as graphs. What are some problems that involve real or complex analysis instead of discrete analysis? If none, why not?


closed as off-topic by D.W., Aryeh, Kaveh, Emil Jeřábek supports Monica, Bruno Feb 11 '18 at 18:14

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    $\begingroup$ I'm not an expert but I think that (i) problems on discrete structures are often real everyday problems (e.g. TSP, knapsack, ...) so they often have real-life applications (ii) there are enough troubles with discrete structures and switching to real analysis often means dealing not only with "hardness" but also with "uncomputability" . BTW there is surely some research on the topic; see for example A simple introduction to computable analysis (which became a book in 2000) ... $\endgroup$ – Marzio De Biasi Feb 7 '18 at 11:22
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    $\begingroup$ ... A simple problem example is: "Is the Mandelbrot set decidable?" (there are several nonequivalent computability notions over the real or complex numbers, so the answer may be positive in one model, negative in another) $\endgroup$ – Marzio De Biasi Feb 7 '18 at 11:38
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    $\begingroup$ See Ker-I Ko's book/papers on complexity theory of real fictions. $\endgroup$ – Kaveh Feb 7 '18 at 12:33
  • $\begingroup$ @Kaveh, in the spirit of Borges and Lem? $\endgroup$ – András Salamon Feb 11 '18 at 12:05
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    $\begingroup$ @Kaveh: just riffing on your "real fictions"... $\endgroup$ – András Salamon Feb 12 '18 at 14:46