In the paper “How to model fake news” by Dorje Brody and David Meier (Brunel University), a mathematical model for fake news based on the theory of information is developed.  A definition is given and two approaches for the modelling of fake news and its impact in elections are introduced.  A preprint of the paper can be found on the arXiv (link here), and a popular article on the work has been published in the MIT Techology Review (link here). The figure on the left is Figure 3 from the above paper.  Based on this work, Prof Brody has submitted written evidence to the Fake News Inquiry currently underway in the UK Parliament (link here).