Mr. and Mrs. Professionalism

Mr. Paint and Mrs. Correct

We introduce a coloring game on graphs, in which each vertex v of a graph G owns a stack of lv−1 erasers. In each round of this game the first player Mr. Paint takes an unused color, and colors some of the uncolored vertices. He might color adjacent vertices with this color – something which is considered “incorrect”. However, Mrs. Correct is positioned next to him, and corrects his incorrect c...

Mr. Paint and Mrs. Correct go Fractional

We study a fractional counterpart of the on-line list colouring game “Mr. Paint and Mrs.Correct” introduced recently by Schauz. We answer positively a question of Zhu by proving that for any given graph the on-line choice ratio and the (off-line) choice ratio coincide. On the other hand it is known from the paper of Alon et al. that the choice ratio equals the fractional chromatic number. It wa...

More about Mrs. Darwin than Mr. Darwin.

After Albert Einstein, Charles Darwin (1809–1882) is perhaps the scientist best known. Several biographies have been published and many essays have been written on both men. Indeed, Darwin wrote his own autobiography, for his children, and many of the thousands of letters he sent and received throughout his life have been gathered. All this information has become readily accessible thanks to se...

Mr and Mrs Punch in Nineteenth-century England*

A B S T R ACT. This article examines the changes and continuities in the depiction of the violent relationship between the popular glove-puppets, Punch and Judy, over the course of the nineteenth century. While the puppet show emerged as a low-brow street entertainment during the first decades of the nineteenth century, by 1850 it had been hijacked by the middle and upper classes, and began to ...

Professionalism.