In the past few months I have been suffering from some problems in my personal life which are now finally over, but I can't get back to doing mathematics like earlier. Please recommend some inspiring mildly serious math books which should contain real math and easy exercises but can be read as a fun read over a week or two so that I can get over my reading slump. I have knowledge of calculus and linear algebra, and differential equations so recommend something related to these or something to be read as a direct successor to these courses. The reads should be short and easy to read and should be something like say for things involving interesting properties of numbers, or say integrals and some new ways to look at things, it shouldn't be a textbook and should be cheap. Thank you.
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