/**
 * Bessel function of the 1st kind.
 *
 * @reference https://en.wikipedia.org/wiki/Bessel_function#Bessel_functions_of_the_first_kind:_J.CE.B1
 */
export declare function cyl_bessel_j(n: number, x: number): number;
/**
 * Bessel function of the 2nd kind.
 *
 * @reference https://en.wikipedia.org/wiki/Bessel_function#Bessel_functions_of_the_second_kind:_Y.CE.B1
 */
export declare function cyl_neumann(v: number, x: number): number;
/**
 * Spherical Bessel function of the 1st kind.
 *
 * @reference https://en.wikipedia.org/wiki/Bessel_function#Spherical_Bessel_functions:_jn.2C_yn
 */
export declare function sph_bessel(n: number, x: number): number;
/**
 * Spherical Bessel function of the 2nd kind.
 *
 * @reference https://en.wikipedia.org/wiki/Bessel_function#Spherical_Bessel_functions:_jn.2C_yn
 */
export declare function sph_neumann(n: number, x: number): number;
/**
 * Modified cylindrical Bessel function of the 1st kind.
 *
 * @reference https://en.wikipedia.org/wiki/Bessel_function#Modified_Bessel_functions:_I.CE.B1_.2C_K.CE.B1
 */
export declare function cyl_bessel_i(n: number, x: number): number;
/**
 * Modified cylindrical Bessel function of the 2nd kind.
 *
 * @reference https://en.wikipedia.org/wiki/Bessel_function#Modified_Bessel_functions:_I.CE.B1_.2C_K.CE.B1
 */
export declare function cyl_bessel_k(n: number, x: number): number;
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