Function: gradient[0](sqrt(numbers("xxy") if numbers('xry') > minus(numbers("xxy"), numbers('xry')) else numbers("per") if minus(numbers("xxy"), numbers('xry')) > divide(numbers('xry') if minus(numbers("xxy"), numbers('xry')) > numbers("per") else numbers("xxy"), minus(numbers("xxy"), numbers('xry'))) else numbers("xxy")))
