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What is anterpolation, and how does it differ from interpolation? I cannot find a definition for the former, but I see it sometimes used (e.g. in the context of Fast Multipole Methods, like here).

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    I found "performed by anterpolation, i.e., the adjoint of interpolation" and "anterpolation (transpose of interpolation)". Must be related somehow to multi-point evaluation. – 2017-02-20
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    Using the comment of LutzL, I found that anterpolation (the adjoint of interpolation) is considered as a Scaling operator. I read that 2D-interpolation is described as the passage from a coarse mesh to a fine mesh and that 2D-anterpolation as the opposite, *i.e.* the transition from a fine mesh to a coarse mesh. Does it make sense in your context ? – 2017-02-20

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