Lucas' Married Couples Problem

• Jump Angle
• Jumping Champion
• Jung's Theorem
• Just If
• Just One
• Kabon Triangles
• Kac Formula
• Kac Matrix
• Kakeya Needle Problem
• Kakutani's Fixed Point Theorem
• Kakutani's Problem
• Kalman Filter
• Kampyle of Eudoxus
• KAM Theorem
• Kanizsa Triangle
• Kantorovich Inequality
• Kaplan-Yorke Conjecture
• Kaplan-Yorke Dimension
• Kaplan-Yorke Map
• Kappa Curve
• Kaprekar Number
• Kaprekar Routine
• Kaps-Rentrop Methods
• Kapteyn Series
• Karatsuba Multiplication