It's Riemann Hypothesis, not Reimann! Named after a Bernhard Riemann, a German mathematician who lived only to the age of 39 and with just his Habilitation Thesis paved the way in mathematics and physics for more than a 100 years.
Whoa, even in Poland it is rare - although not unheard of - to drink spirytus (96% b.v.), undiluted.
Although it is used to create very strong drinks, ranging at 70-80%.