export function matrixInverse33(A: any, threshold: any): number[] | null;
export function matrixMul33(A: any, B: any): number[];
export function quadrilateralConvex(x1: any, x2: any, x3: any, x4: any): boolean;
export function smallestTriangleArea(x1: any, x2: any, x3: any, x4: any): number;
export function multiplyPointHomographyInhomogenous(x: any, H: any): number[];
export function checkThreePointsConsistent(x1: any, x2: any, x3: any, x1p: any, x2p: any, x3p: any): boolean;
export function checkFourPointsConsistent(x1: any, x2: any, x3: any, x4: any, x1p: any, x2p: any, x3p: any, x4p: any): boolean;
export function determinant(A: any): number;