/**
 * Return the gamma function of `n`.
 *
 * For a positive integer, the result is the exact product `(n - 1)!`. A non-positive integer
 * gives Infinity, and a non-finite integer gives NaN. The result overflows to Infinity for
 * an integer above 171 and for a value of 171.35 or more. Other values use the reflection
 * formula below 0.5, a Stirling series above 85, and the Lanczos approximation otherwise.
 */
export declare function gammaNumber(n: number): number;
export declare namespace gammaNumber {
    var signature: string;
}
export declare const gammaG: number;
export declare const gammaP: number[];
export declare const lnSqrt2PI: number;
export declare const lgammaG: number;
export declare const lgammaN: number;
export declare const lgammaSeries: number[];
/**
 * Return the natural logarithm of the gamma function of `n`.
 *
 * A negative `n` gives NaN, and 0 gives Infinity. A non-finite `n` is returned unchanged.
 * Values below 0.5 use the reflection formula. Other values use the Lanczos method.
 */
export declare function lgammaNumber(n: number): number;
export declare namespace lgammaNumber {
    var signature: string;
}
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