Sir William Flinders Petrie, F. R. S., F. B. A

نامساوی های زیرجمعی ماتریسی برای (f(a+b و(f(a)+f(b

در سال 1999 اندو وژان یک نامساوی زیر جمعی برای توابع مقعر عملگری بدست آوردند. ما این نامساوی را به همه توابع مقعر توسعه می دهیم: ماتریس های نیمه معین مثبت a وb تابع مقعر غیرمنفی f روی (&,0] را در نظر می گیریم. برایس هر نرم متقرن داریم. ||| (f(a)+f(b) ||| > |||f(a+b)|||

B R I E F N O T E S

Cultured cells cloned from the C1300 neuroblastoma have been shown by several laboratories to extend neurites (1-6) and to accumulate nervespecific enzymatic activities (7) when grown under conditions in which cell division is inhibited. Study of this system has been stimulated by the hope that it might serve as an in vitro model of nerve cell differentiation. Many of the neurite-inducing agent...

James F . Crow and William F . Dove

LUTHER Burbank was a curious mixture: part garStalin’s ear. He was arrested in 1940 while on a collecting trip and was sentenced to death, but this was rescinded dener, part artist, part P. T. Barnum. He was responsible for a plethora of improved fruits, vegetables, in June 1942. He died in prison in 1943. Had he been able to continue his program, he would surely have and ornamentals. Some of t...

And Cubic F O R M S

James F . Crow and William F . Dove Edward B . Lewis , 1918 – 2004

was an avid performer of chamber music. Along the way EDWARD B. Lewis (Figure 1) started experimenting he developed a passion for opera and in later life rarely with Drosophila as a high school student and never missed a chance to attend a performance. A second stopped. His enthusiasm never waned. Except for 4 years interest that started in childhood was animals, especially as a meteorologist d...