In mathematical analysis, Trudinger's theorem or the Trudinger inequality (also sometimes called the Moser–Trudinger inequality) is a result of functional analysis on Sobolev spaces. It is named after Neil Trudinger (and Jürgen Moser). It provides an inequality between a certain Sobolev space norm and an Orlicz space norm of a function. The inequality is a limiting case of Sobolev imbedding and can be stated as the following theorem: Let be a bounded domain in satisfying the cone condition. Let and . Set Then there exists the embedding where The space is an example of an Orlicz space. References . . Sobolev spaces Inequalities Theorems in analysis