/**
 * Return logarith value and base
 *
 * @category Utilities
 *
 * @param n number
 * @param base number
 */
export declare const log: (n: number, base: number) => number;
/**
 * @category Utilities
 */
export declare const PI2: number;
/**
 * @category Utilities
 */
export declare const PHI: number;
/**
 * Return a positive module of positive or negative value
 *
 * @category Utilities
 *
 * @param value number
 * @param base number
 */
export declare const mod: (value: number, base: number) => number;
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