Russell E. Larson

Russell Foster

the midst of raw sewage. In 2001, The EPA also found itself in trouble after declaring Ground Zero air clear, soon after the September 11th attacks. Local officials later heaped criticism on the EPA for that call. Even though the air was within normal limits, noxious dust coated buildings — and poorly protected cleaning crews were sent in to clean up that mess after the EPA’s all-clear. It’s al...

Severe Silver-Russell syndrome.

Three children are described with severe Silver-Russell syndrome. Major medical problems occurred in the first two years of life in all three. Silver-Russell syndrome should be considered in the differential diagnosis of children with severe pre- and postnatal growth deficiency.

Russell, Causation, Determinism

Two arguments due to Russell are examined, and found to show that the notion of causation as full determination doesn’t mesh easily with deterministic global physics and the distinction between effective and ineffective strategies. But a local notion of causation as involving a certain kind of counterfactual dependence is, I argue, compatible with Russell’s conclusions. I defend it from a resur...

Russell and Logical Ontology

Grossman-Larson Hopf algebras built on rooted trees

In [8], Dirk Kreimer discovered the striking fact that the process of renormalization in quantum field theory may be described, in a conceptual manner, by means of certain Hopf algebras (which depend on the chosen renormalization scheme). A toy model was studied in detail by Alain Connes and Dirk Kreimer in [3]; the Hopf algebra which occurs, denoted by HR, is the polynomial algebra in an infin...