I don't know if this is the right place to discuss this, but it might
possibly be of relevance to new users of deal.ii
There might be a minor error in a graphic used in the slides corresponding
to video lecture 15 of MATH676 (topic: cell refinement introduction)
In the longest edge refinement and red-green refinement strategies, the
discussion pertains to triangular meshes.
However, the right-most (slightly bottom-right) cell is actually a
quadrilateral! (see slides 10-15, 19-23) in
https://www.math.colostate.edu/~bangerth/videos/676/slides.15.pdf. This is
not an issue, since the refinement does not propagate onto this cell in the
given example of longest-edge refinement, but certainly seems awkward when
shaded red in the red-green refinement strategy.
This is just a really minor observation, and does not seem to affect any
concepts discussed at all. Perhaps, an informal notice may be posted on the
lecture's landing page, if deemed appropriate.
Regards,
Krishna
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