The flow group of rooted abelian or quadratic differentials

no code implementations • 28 Jan 2021 • Mark Bell, Vincent Delecroix, Vaibhav Gadre, Rodolfo Gutiérrez-Romo, Saul Schleimer

We define the flow group of any component of any stratum of rooted abelian or quadratic differentials (those marked with a horizontal separatrix) to be the group generated by almost-flow loops.

Dynamical Systems 30F60 (Primary) 37D40, 37G15, 37A20 (Secondary)

ARCHANGEL: Tamper-proofing Video Archives using Temporal Content Hashes on the Blockchain

no code implementations • 26 Apr 2019 • Tu Bui, Daniel Cooper, John Collomosse, Mark Bell, Alex Green, John Sheridan, Jez Higgins, Arindra Das, Jared Keller, Olivier Thereaux, Alan Brown

We present ARCHANGEL; a novel distributed ledger based system for assuring the long-term integrity of digital video archives.

Marginal sequential Monte Carlo for doubly intractable models

no code implementations • 12 Oct 2017 • Richard G. Everitt, Dennis Prangle, Philip Maybank, Mark Bell

Bayesian inference for models that have an intractable partition function is known as a doubly intractable problem, where standard Monte Carlo methods are not applicable.

Bayesian Inference