/**
 * faster approximation for real numbers
 */
export declare const gamma_ln: (z: number) => number;
/**
 * series representation
 */
export declare const gamma_series: (a: number, x: number) => number | false;
/**
 * continued fraction
 */
export declare const gamma_cf: (a: number, x: number) => number | false;
/**
 * regularized gamma function; CDF of gamma distribution with scale 1
 */
export declare const gamma_p: (a: number, x: number) => number | false;
/**
 * regularized gamma function
 */
export declare const gamma_q: (a: number, x: number) => number | false;