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It would be wrong to assume that one must stay with a research programme until it has exhausted all its heuristic power, that one must not introduce a rival programme before everybody agrees that the point of degeneration has probably been reached.

如果认为一个人必须坚持一个研究项目，直到它用尽了所有的启发式能力，在所有人都同意可能已经达到堕落的地步之前，他不能引入一个竞争对手的项目，这将是错误的。

— Imre Lakatos 拉卡托斯