Charlie Eppes is a fictional character from the television series Numb3rs, which aired from 2005 to 2010. He is portrayed as a brilliant mathematician who uses his expertise to help the FBI solve crimes. Charlie often applies mathematical concepts and statistical analysis to uncover patterns and predict criminal behavior. In the series, Charlie is the younger brother of Don Eppes, an FBI agent. Their relationship is central to the show, highlighting the contrast between Charlie's academic world and Don's practical law enforcement duties. Together, they demonstrate how mathematics can be applied to real-world problems, bridging the gap between theory and practice.