Category Archives: Pretty little things

Mutual сoherence II

Arthur Gilmullin, a friend of mine, recently came up with another solution of the mutual coherence problem. It also works for    (where    is the space dimension). The reformulation of the bound is also due to him. Here is the … Continue reading

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Mutual сoherence I

Today, after getting to know about Mutual coherence, I became interested in the following problem. Let    be an    matrix,    with distinct columns    on a unit sphere in    Its mutual coherence is then defined as We … Continue reading

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