The New York Times Book of Mathematics
Gina Kolata
Introduction

Some, not surprisingly, are just odd people, geniuses but eccentric almost beyond belief. That, at least, describes Paul Erdos, a Hungarian mathematician who had no home and no job. Other mathematicians invited him into their homes, feeding and housing himâ€”and collaborating with himâ€”until he moved on to another mathematician's home. He also took on the question that opens this book. Are mathematical truths discovered or invented?