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# 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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