A property that describes a set or decision problem S that is not decidable, that is, for which the characteristic function of S (i.e., the function that maps elements of S to 1 and non-elements of S to 0) is not computable.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。