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.
Let ([zeta]) denote the functional equation for the zeta function and (S) the classical sampling theorem; furthermore, let (C) denote the expansion of the cotangent function in partial fractions, (F) a special Fourier series, and (v) the functional equation for Jacobi's theta function.