/**
 * @packageDocumentation
 * @module std
 */
/**
 * Gamma function.
 *
 * @reference https://en.wikipedia.org/wiki/Gamma_function, https://rosettacode.org/wiki/Gamma_function#JavaScript
 */
export declare function tgamma(x: number): number;
/**
 * Log gamma function.
 */
export declare function lgamma(x: number): number;
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