Function: mod(logn(gradient[2](product(minus(numbers('yxr') if numbers("xxr") > numbers("xyx") else numbers('xry'), numbers("xxr")), numbers('yxr') if numbers("xyx") > numbers('xry') else numbers("xxr")))), gradient[2](product(minus(numbers("xxr") if numbers("xyx") > numbers('yxr') else numbers('xry'), numbers("xxr")), numbers("xyx") if numbers('xry') > numbers("xxr") else numbers('yxr'))))
