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Gamma, Beta, Erf > FresnelS[z] > Introduction to the Fresnel integrals

The best-known properties and formulas for Fresnel integrals

For real values of argument , the values of the Fresnel integrals and are real.

The Fresnel integrals and have simple values for arguments and :

The Fresnel integrals and are defined for all complex values of , and they are analytical functions of over the whole complex ‐plane and do not have branch cuts or branch points. They are entire functions with an essential singular point at .

The Fresnel integrals and do not have periodicity.

The Fresnel integrals and are odd functions and have mirror symmetry:

The Fresnel integrals and have rather simple series representations at the origin:

These series converge at the whole ‐plane and their symbolic forms are the following:

Interestingly, closed-form expressions for the truncated version of the Taylor series at the origin can be expressed through the generalized hypergeometric function , for example:

The asymptotic behavior of the Fresnel integrals and can be described by the following formulas (only the main terms of asymptotic expansion are given):

The previous formulas are valid in any directions of approaching point to infinity (). In particular cases when and , the formulas can be simplified to the following relations:

The Fresnel integrals and have the following simple integral representations through sine or cosine that directly follow from the definition of these integrals:

The argument of the Fresnel integrals and with square root arguments can sometimes be simplified:

The derivatives of the Fresnel integrals and are the sine or cosine functions with simple arguments:

The symbolic derivatives of the order have the following representations:

The Fresnel integrals and satisfy the following third-order linear ordinary differential equation:

They can be represented as partial solutions of the previous equation under the following corresponding initial conditions:

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