Ilija Kalderov

Ilija Kalderov is a Bulgarian mathematician who represented Bulgaria at the 12th International Mathematical Olympiad (IMO 1970) in Keszthely, Hungary. Competing as one of eight Bulgarian team members led by Kiril Dotchev, he scored 21 points out of 40, placing 44th of 112 contestants and earning a bronze medal. He is listed among Bulgaria's IMO medalists in the official IMO Hall of Fame for Bulgaria. Beyond his olympiad record, no further public biographical or professional footprint has been located.

Notes2

• Competed for Bulgaria at the 12th IMO (1970, Keszthely, Hungary), scoring 21 points and placing 44th of 112 contestants with a bronze medal.
• Listed among Bulgaria's IMO medalists in the official IMO Hall of Fame for Bulgaria, confirming his olympiad standing is still recorded by the IMO.
• Part of the eight-member Bulgarian team at IMO 1970 under leader Kiril Dotchev; the team ranked 7th with 145 points, and teammates Milen Dimchev and Stepan Terzijan also took bronze with 24 points each.