Tomasz Dybowski (1923-2009)

Tomasz Downarowicz and Jacek Serafin

We show that if y = (yn)n≥1 is a bounded sequence with zero average along every infinite arithmetic progression then for every N ≥ 2 there exist (unilateral or bilateral) subshifts Σ over N symbols, with entropy arbitrarily close to logN , uncorrelated to y. In particular, for y = μ being the Möbius function, we get that there exist subshifts as above which satisfy the assertion of Sarnak’s con...

Tomasz Imielinski and Julio C

The Global Positioning System can be used to give every terminal a geographic address for multicasting to and from recipients within specified geographical areas.

Bernard Dwork 1923--1998

Bernard Morris Dwork, “Bernie” to those who had the privilege of knowing him, died on May 9, 1998, just weeks short of his seventyfifth birthday. He is survived by his wife of fifty years, Shirley; his three children, Andrew, Deborah, and Cynthia; his four granddaughters; his brothers Julius and Leo; and his sister, Elaine Chanley. We mention family early in this article, both because it was su...

Carl Djerassi (1923–2015)

Few lives at the top of chemistry and industrial accomplishments in the 20th century have been as remarkable as that of Carl Djerassi, who died in San Francisco on January 30 at the age of 91. To a considerable extent, his life became known as ‘fascinating’, catalyzed by his own portrayal of it. This feature of his persona cannot, and will not, dilute the one major scientifi c contribution he m...

Walter A. Jacobs, 1923