I found on a book that there exists R-modules M such that supp(M) is not Zariski-closed. I already know that if M is finitely generated then it is Zariski closed but I can't find an example of a non finitely generated R-module that is not Zariski closed. I found an answer on a book but I can't understand it well, it is too complicated and I'm quite new in this topic. I'm just looking for a simple example of this. Thank you
2026-03-25 13:59:04.1774447144
Example where supp(M) is not Zariski-closed
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