/**  Fraction class. */
export declare class Fraction {
    n: number;
    d: number;
    constructor(n: number, d?: number);
    get decimal(): number;
    get sign(): 1 | 0 | -1;
    get simplified(): Fraction;
    get inverse(): Fraction;
    toMathML(): string;
    toString(): string;
    static fromDecimal(x: number, max?: number): Fraction;
    static fromString(s: string): Fraction | undefined;
    add(a: Fraction | number): Fraction;
    subtract(a: Fraction | number): Fraction;
    multiply(a: Fraction | number): Fraction;
    divide(a: Fraction | number): Fraction;
    /** Calculates the sum of two fractions a and b. */
    static sum(a: Fraction | number, b: Fraction | number): Fraction;
    /** Calculates the difference of two fractions a and b. */
    static difference(a: Fraction | number, b: Fraction | number): Fraction;
    /** Calculates the product of two fractions a and b. */
    static product(a: Fraction | number, b: Fraction | number): Fraction;
    /** Calculates the quotient of two fractions a and b. */
    static quotient(a: Fraction | number, b: Fraction | number): Fraction;
}