LehrFEM++ is a simple Finite Element Framework for research and education optimized for clarity and flexibility with some trade-off concerning performance.

LehrFEM++ has been developed by as code platform for the course "Numerical Methods for Partial Differential Equations" regularly taught for second-year BSc students at ETH Zurich. Chapter 2 of the lecture notes (work in progress!) discuss fundamental algorithms for finite element methods and Sections 2.7 and 2.8 even give details about data structures and algorithms used in LehrFEM++.

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