The ever-expanding field of extremal graph theory encompasses an array of problem-solving methods, including applications to economics, computer science, and optimization theory. This volume presents a concise yet comprehensive treatment, featuring complete proofs for almost all of its results and numerous exercises. 1978 edtion.

帮助3年级学生提升数学思维能力的同时提升英语词汇、英语语法和句子的逻辑理解能力，用英语做数学题，实现英语和数学的双双提高，为小朋友小升初衔接夯实基础。 新加坡数学注重建模教学，数学科目的学习和练习真正地让孩子形成数感，逻辑思维和抽象思维，是解决问题的方法，而非纯粹的记忆。

These simple math secrets and tricks will forever change how you look at the world of numbers. Secrets of Mental Math will have you thinking like a math genius in no time. Get ready to amaze your friends and yourself with incredible calculations you never thought you could master, as renowned mathemagician Arthur Benjamin shares his techniques for lightning-quick calculations and amazing number tricks. This book will teach you to do math in your head faster than you ever thought possible, dramatically improve your memory for numbers, and maybe for the first time make mathematics fun. Yes, even you can learn to do seemingly complex equations in your head; all you need to learn are a few tricks. You ll be able to quickly multiply and divide triple digits, compute with fractions, and determine squares, cubes, and roots without blinking an eye. No matter what your age or current math ability, Secrets of Mental Math will allow you to perform fantastic feats of the mind effortlessly. This is the math they n