# 34 micromass   Posts: 11,313 Blog Entries: 8 Quote by Matt Benesi There is also the infinitesimal approach. There is a hyperreal number [itex]\epsilon[/itex] that is smaller than the smallest real number, so we can define the following: [itex] 1 - \epsilon = .999...[/itex]. This implies that [itex]1[/itex]