Function: minus(numbers('xyy'), numbers("xyx")) if numbers("xyx") > numbers('xyy') else minus(minus(numbers('xyy'), numbers("xyx")), numbers('xyy')) if minus(minus(numbers('xyy'), numbers("xyx")), numbers('xyy')) > minus(numbers('xyy'), numbers("xyx")) else sqrt(minus(minus(numbers('xyy'), numbers("xyx")), numbers('xyy')) if numbers("xyx") > numbers('xyy') else minus(numbers('xyy'), numbers("xyx")))