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Unsolved problem in combinatorial geometry
mathematics The Kobon triangle problem is an unsolved problem in combinatorial geometry first stated by Kobon Fujimura (1903-1983). The problem asks for the
Kobon_triangle_problem
Pseudolines arranged largely to study arrangements of lines
puzzle. The Kobon triangle problem is an unsolved problem in combinatorial geometry first stated by Kobon Fujimura (1903-1983). The problem asks for the
Arrangement_of_pseudolines
Prieto-Martínez, Luis Felipe (2021). "El problema de los triángulos de Kobon" [The Kobon triangles problem]. La Gaceta de la Real Sociedad Matemática Española (in Spanish)
List of unsolved problems in mathematics
List_of_unsolved_problems_in_mathematics
Subdivision of the plane by lines
given number of lines passing below them. Roberts's triangle theorem and the Kobon triangle problem concern the minimum and maximum number of triangular
Arrangement_of_lines
On triangles in line arrangements
theorem guarantees that three triangles will exist, but the solution to the Kobon triangle problem has five triangles. Despite the fact that these seem
Roberts's_triangle_theorem
Johnson circles Kepler triangle Kobon triangle problem Kosnita's theorem Leg (geometry) Lemoine's problem Lester's theorem List of triangle inequalities Mandart
List_of_triangle_topics
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