isoptic

[ī′säp·tik]

(mathematics)

The locus of the intersection of tangents to a given curve that meet at a specified constant angle.

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for a given oval C the isoptic [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII.

Note that the equation of isoptic [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII.

beta], [gamma]] ([alpha], t) is a diffeomorphism, similarly as it was for isoptics F0,0 ([alpha], t).

1) can be found in [7] but in [1] authors used the isoptics to prove it.

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