Katharina Lettau und Heinz Person-Info 

( Ich bin Katharina Lettau)
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Why Do Math? Reading Room: Political Calculus by Barry A. Cipra

www.whydomath.org
In the 1970s, Heinz and Katharina Lettau of the University of Wisconsin modified Bagnold’s formula to make flux proportional to u 2 (u – u t)
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