/** Immutable complex number. */
export type Complex = {
    readonly re: number;
    readonly im: number;
};
export declare const ZERO: Complex;
export declare const ONE: Complex;
export declare const I: Complex;
export declare const c: (re: number, im?: number) => Complex;
export declare const add: (a: Complex, b: Complex) => Complex;
export declare const mul: (a: Complex, b: Complex) => Complex;
export declare const scale: (s: number, a: Complex) => Complex;
export declare const conj: (a: Complex) => Complex;
/** |a|² — probability weight of an amplitude. */
export declare const norm2: (a: Complex) => number;
export declare const isNegligible: (a: Complex) => boolean;
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