•  34
    Trichotomies for Ideals of Compact Sets
    with É Matheron and S. Solecki
    Journal of Symbolic Logic 71 (2). 2006.
    We prove several trichotomy results for ideals of compact sets. Typically, we show that a "sufficiently rich" universally Baire ideal is either $\Pi _{3}^{0}$-hard, or $\Sigma _{3}^{0}$-hard, or else a σ-ideal
  •  22
    Autopoiesis Applies to Social Systems Only
    Constructivist Foundations 10 (2): 186-189. 2015.
    Open peer commentary on the article “The Autopoiesis of Social Systems and its Criticisms” by Hugo Cadenas & Marcelo Arnold. Upshot: I reaffirm and extend the notion of social autopoiesis away from mere labels and descriptions to acting physical components of social systems and societies, ranging from subcellular to biological and human. All self-producing biological organisms are essentially societies of interacting components and therefore notions of autopoiesis and social systems are fundamen…Read more