The task of text classification is easier when there is little overlap between the characteristic terms of different topics. This is because the presence of common terms can make it difficult to distinguish between different topics. On the other hand, when there is little overlap between the characteristic terms of different topics, the task of text classification becomes easier, as the unique terms of each topic provide a solid basis for accurately classifying the document into its respective category. Therefore, careful selection of characteristic terms for each topic is crucial to ensure accuracy in text classification.