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A mathematician handed me this note about what he said was about matroids and that matroids are groups (like algebraic groups).

Is that true?

What is this mathematics about?

Is this even about matroids?

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Thank you Martin. I've used convolution integral in mathematical statistics (something about tau) and will go thru the material you link to. –  Niklas Rtz Jan 29 '13 at 11:37

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