This lecture paper re-presents the proof that Lagrange interpolation error on any triangle is bounded in terms of its circumradius, with no shape regularity or maximum angle assumption.
Atkinson: An Introduction to Numerical Analysis, 2nd edition, John Wiley & Sons, New York, 1989
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Lectures on error analysis of interpolation on simplicial triangulations without the shape-regularity assumption Part 1: Lagrange interpolation on triangles
This lecture paper re-presents the proof that Lagrange interpolation error on any triangle is bounded in terms of its circumradius, with no shape regularity or maximum angle assumption.