## Abstract

There are three versions of the finite element method. The classical *h version*, which achieves the accuracy by refining the mesh while using low degrees *p* of the elements, usually *p* = 1, 2. The *p version* keeps the mesh fixed, and the accuracy is achieved by increasing the degree *p*. The *h-p version* combines both approaches.

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Babuška, I. (1988). The *p* and *h-p* Versions of the Finite Element Method: The State of the Art.
In: Dwoyer, D.L., Hussaini, M.Y., Voigt, R.G. (eds) Finite Elements. ICASE/NASA LaRC Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-3786-0_10

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