Axel Thue
Axel Thue was a Norwegian mathematician, known for his original work in diophantine approximation and combinatorics.
Work
Thue published his first important paper in 1909.He stated in 1914 the so-called Semi-Thue system#The word [problem for semi-Thue systems|word problem for semigroups] or Thue problem, closely related to the halting problem.
His only known PhD student was Thoralf Skolem.
The esoteric programming language Thue is named after him.