The question was asked by Ronald Brown

Van der Linden, Tim
(2025) XV Portuguese Category Seminar — Location: Aveiro, Portugal (11.September.2025)

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Abstract
This talk is dedicated to Ronnie Brown—who passed away last year—and highlights some of his many original ideas. I will sketch the influence of his work and legacy, both on my own research and on categorical algebra more broadly. In particular, I will elaborate on two questions he first posed: What is a double crossed module? and What is a double central extension?
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Van der Linden, T. (2025). The question was asked by Ronald Brown. XV Portuguese Category Seminar, Aveiro, Portugal.