Jackson

• Cross Polytope
• Euler Line
• Fuhrmann Circle
• GEOS Circle
• Gergonne Line
• Incenter
• Injection
• Inner Soddy Circle
• Johnson Circles
• Johnson Circumconic
• Johnson's Theorem
• Johnson Triangle
• Johnson-Yff Circles
• Kernel
• Medial Triangle
• Orthic Axis
• Orthocenter
• Orthocentroidal Circle
• Outer Soddy Circle
• Rank-Nullity Theorem
• Regular Tetrahedron
• Simson Line
• Soddy Line
• Spherical Excess