A Generalization Lester theorem follow:
Theorem: Let two point 
lie on one branch of a rectangular hyperbola. The line pass through midpoint of 
, and pass through center of the hyperbola cut hyperbola at two point 
. Let four points 
are harmonic range then four point 
lie on a circle.
lie on one branch of a rectangular hyperbola. The line pass through midpoint of , and pass through center of the hyperbola cut hyperbola at two point . Let four points are harmonic range then four point lie on a circle.
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