Browse history From year (and earlier): From month (and earlier): all January February March April May June July August September October November December Deleted only For any version listed below, click on its date to view it. For more help, see Help:Page history. (cur) = difference from current version, (prev) = difference from preceding version, m = minor edit, → = section edit, ← = automatic edit summary (cur | prev) 02:10, December 13, 2018 Canzex (wall | contribs) . . (706 bytes) (+23) . . (Adding categories) (undo) (cur | prev) 10:31, June 21, 2017 188.8.131.52 (wall) . . (683 bytes) (+683) . . (created page added basic information will add more) (VisualEditor) Retrieved from "https://911-operator.fandom.com/wiki/Mathematical_problem" Community content is available under CC-BY-SA unless otherwise noted.