Schwinger Model

Intuitive

Explanations in this section should contain no formulas, but instead colloquial things like you would hear them during a coffee break or at a cocktail party.

Concrete

In this section things should be explained by analogy and with pictures and, if necessary, some formulas.

Abstract

The motto in this section is: the higher the level of abstraction, the better.

Why is it interesting?

Massless (1+1) QED has many properties that resemble QCD: confinement, theta-vacuum, axial anomaly, … and is exactly soluble

http://physik.uni-graz.at/schladming2015/LectureNotes/Kharzeev4.pdf