Mathematics of Eternity is the first entry in the Joe Ballen series by author David M. Kelly. I enjoyed the worldbuilding above all else! Fans of dystopian near-future sci-fi should check this out!
Full review: https://www.goodreads.com/review/show/5397333351
Get yourself a copy: https://books2read.com/MOE-JB1
More from David M. Kelly: https://davidmkelly.com/