Tangency Theorem

The external (internal) Similarity Point of two fixed Circles is the point at which all theCircles homogeneously (nonhomogeneously) tangent to the fixed Circles have the samePower and at which all the tangency secants intersect.

References

Dörrie, H. 100 Great Problems of Elementary Mathematics: Their History and Solutions. New York: Dover, p. 157, 1965.

• Lebesgue Singular Integrals
• Lebesgue-Stieltjes Integral
• Lebesgue Sum
• Le Cam's Identity
• Leech Lattice
• Lefshetz Fixed Point Formula
• Lefshetz's Theorem
• Lefshetz Trace Formula
• Leg
• Legendre Addition Theorem
• Legendre Differential Equation
• Legendre Duplication Formula
• Legendre Function of the First Kind
• Legendre Function of the Second Kind
• Legendre-Gauss Quadrature
• Legendre-Jacobi Elliptic Integral
• Legendre Polynomial
• Legendre Polynomial of the Second Kind
• Legendre Quadrature
• Legendre Relation
• Legendre's Chi-Function
• Legendre's Constant
• Legendre Series
• Legendre's Factorization Method
• Legendre's Formula