Relevance information: a loss of entropy but a gain for IDF?

@inproceedings{vries-2005-relevance, author = {Arjen P. de Vries and Thomas R\"{o}lleke}, editor = {Ricardo Baeza-Yates and Nivio Ziviani and Gary Marchionini and Alistair Moffat and John Tait}, title = {{Relevance information: a loss of entropy but a gain for IDF?}}, booktitle = {{SIGIR 2005: Proceedings of the 28th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, Salvador, Brazil, August 15-19, 2005}}, pages = {282--289}, publisher = {ACM}, year = {2005}, url = {https://doi.org/10.1145/1076034.1076084}, doi = {https://doi.org/10.1145/1076034.1076084} }