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Sergei Haller
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sergei@sergei-haller.de
btexx GmbH
Dr. Sergei Haller
btexx business technologies GmbH
Rheinstraße 4N
55116 Mainz
Germany
tel:
+49(6131)62228-0
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+49(6131)62228-70
sergei.haller@btexx.de
www.btexx.com
"Obvious" is the most dangerous word in mathematics.
-- Bell, Eric Temple