Not a Penny More, Not a Penny Less Not a Penny More, Not a Penny Less Not a Penny More, Not a Penny Less was Jeffrey Archer's first novel, first published in 1976. It was said to have been inspired by Archer's real-life experience of near-bankruptcy. Harvey Metcalfe, over 40 years, has mastered the shady deal in advancing from messenger boy to mogul. But by selling inflated oil stock, he has cheated the wrong men - Stephen Bradley, an American professor at the University of Oxford, Dr Robin Oakley, a Harley Street doctor, Jean-Pierre Lamanns, a French art dealer with a gallery in London, and James Brigsley, heir
Penny graph despite their restricted structure, there exist penny graphs that do still require four colors. Analogously, the degeneracy of every triangle-free penny graph is at most two. Every such graph contains a vertex with at most two neighbors, even though it is not always possible to find this vertex on the convex hull. Based on this one can prove that they require at most three colors, more easily than the proof of the more general Grötzsch's theorem that triangle-free planar graphs are 3-colorable. A maximum independent set in a penny graph is a subset of the pennies, no two of which