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À la mémoire de mon père, Alexandre.
Pour ma mère, Francine.
Preface to the Sparse Edition
I cannot help but find striking resemblances between munities and
schools of fish. We interact in conferences and through articles, and we move
together while a global trajectory emerges from individual contributions. Some of
us like to be at the center of the school, others prefer to wander around, and a few
swim in multiple directions in front. To avoid dying by starvation in a progressively
narrower and specialized domain, a munity needs also to move on.
Computational harmonic analysis is still very