An informal argument shows that common knowledge of rationality implies the iterative elimination of strictly dominated strategies. Rationality here means that players do not play strategies that are strictly dominanted relative to their knowledge. We formalize and prove this claim. When by rationality we mean that players do not play strategies that are weakly dominanted relative to their know...

Introduction Liberal egalitarianism is a variant of liberal political philosophy that emphasizes the obligation of society to enable its most poor and disadvantaged members to lead decent lives. Liberal egalitarianism fuses the traditional liberal theme of individual freedom and autonomy and a more radical theme of equal life prospects for all. Today the two foremost proponents of liberal egali...

Researchers have designed a metamaterial that is nearly twice as resistant to cracking in one direction versus the other—what they call fracture diode.