Jens Frehse Books

Regularity Results for Nonlinear Elliptic Systems and Applications

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The book collects many techniques that are helpul in obtaining regularity results for solutions of nonlinear systems of partial differential equations. They are then applied in various cases to pro...

Regularity Results for Nonlinear Elliptic Systems and Applications

By Alain Bensoussan, Jens Frehse

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Mean Field Games And Mean Field Type Control Theory

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Mean field games and Mean field type control introduce new problems in Control Theory. The terminology “games” may be confusing. In fact they are control problems, in the sense that one is interest...

Mean Field Games and Mean Field Type Control Theory

By Alain Bensoussan, Jens Frehse, Phillip Yam

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Regularity Results for Nonlinear Elliptic Systems and Applications

By Alain Bensoussan, Jens Frehse

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.