Deep inelastic muon scattering at FERMILAB

As a second-generation Fermilab muon experiment, E203/391 was designed to have high sensitivity to any number of muons in the final state. This allowed a broad range of lepto-induced physics to be studied ranging from exotic 4- and 5-muon final states to deeply fundamental inelastic structure function measurements. The experimental apparatus and triggers are described along with the general scheme of the analysis. Next, a brief outline of some of the rich results of the multimuon final state to give a feeling for the apparatus performance and also a feeling for what to look forward to in the coming year. And, finally, a more detailed discussion of the early work on deep inelastic structure functions