Lene Hau. Lene Vestergaard Hau (born November 13, 1959 in Vejle, Denmark) is a Danish physicist. In 1999, she led a Harvard University team who, by use of a Bose-Einstein condensate, succeeded in slowing a beam of light to about 17 metres per second, and, in 2001, was able to stop a beam completely.
Zeta is the sixth letter of the Greek alphabet. In the system of Greek numerals, it has a value of 7. It was derived from the Phoenician letter zayin. Letters that arose from zeta include the Roman Z and Cyrillic Ð.
The following exact values are implemented. 1  If and z is an even integer, 2  If and z is an odd integer. For , zeta(z) returns an unevaluated function call. 3  If and z is an even integer. For , zeta(z) returns an unevaluated function call. 4  If 5  , If the argument does not evaluate to a listed special value, zeta returns the symbolic function call.