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Brian Clegg - Game Theory: Understanding the Mathematics of Life

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Brian Clegg Game Theory: Understanding the Mathematics of Life
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Brian Clegg was always fascinated by Isaac Asimovs classic Foundation series of books, in which the future is predicted using sophisticated mathematical modelling of human psychology and behaviour.
Only much later did he realise that Asimovs psychohistory had a real-world equivalent: game theory.
Originating in the study of probabilistic gambling games that depend on a random source - the throw of a dice or the toss of a coin - game theory soon came to be applied to human interactions: essentially, what was the best strategy to win, whatever you were doing? Its mathematical techniques have been applied, with varying degrees of wisdom, to fields such as economics, evolution, and questions such as how to win a nuclear war.
Clegg delves into game theorys colourful history and significant findings, and shows what we can all learn from this oft-misunderstood field of study.

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i Hot Science is a series exploring the cutting edge of science and - photo 1

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Hot Science is a series exploring the cutting edge of science and technology. With topics from big data to rewilding, dark matter to gene editing, these are books for popular science readers who like to go that little bit deeper

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Destination Mars:
The Story of Our Quest to Conquer the Red Planet

Big Data:
How the Information Revolution is Transforming Our Lives

Gravitational Waves:
How Einsteins Spacetime Ripples Reveal the Secrets of the Universe

The Graphene Revolution:
The Weird Science of the Ultrathin

CERN and the Higgs Boson:
The Global Quest for the Building Blocks of Reality

Cosmic Impact:
Understanding the Threat to Earth from Asteroids and Comets

Artificial Intelligence:
Modern Magic or Dangerous Future?

Astrobiology:
The Search for Life Elsewhere in the Universe ii

Dark Matter & Dark Energy:
The Hidden 95% of the Universe

Outbreaks & Epidemics:
Battling Infection From Measles to Coronavirus

Rewilding:
The Radical New Science of Ecological Recovery

Hacking the Code of Life:
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Behavioural Economics:
Psychology, Neuroscience, and the Human Side of Economics

Quantum Computing:
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The Space Business:
From Hotels in Orbit to Mining the Moon How Private Enterprise is Transforming Space

Game Theory:
Understanding the Mathematics of Life

Hothouse Earth:
An Inhabitants Guide

Hot Science series editor: Brian Clegg

vii

For Gillian, Chelsea and Rebecca

viii ix x

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CONTENTS
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xiii

Thanks to the staff at Icon Books, notably Duncan Heath and Robert Sharman. Many years ago, I took an MA in Operational Research at the University of Lancaster, which introduced me to some of the concepts of game theory. My thanks to the lecturers there, particularly Graham Rand, who is still involved with the university. He edits the operational research magazine Impact, for which I have written many articles, including one that led me to look more into auctions and game theory. xiv

When I first bought a textbook on game theory many years ago, never having come across the term before, I felt cheated. I was expecting something fun that would tell me the optimal strategies for winning at card games, backgammon and Monopoly. I wanted an interesting analysis of how the games worked mathematically under the hood. Ideally there would also be guidance on how to create your own interesting board games. Instead, I found descriptions of a series of games that no one had ever played, with tables of outcomes that did not so much give guidance as show just how impossible it often was to come up with a useful outcome. This was interspersed with a hefty load of mathematical equations. And yet, the more I read about game theory, the closer it seemed to one of my favourite classics of science fiction.

For his 1950s Foundation series of books (made into a TV show in 2021), Isaac Asimov came up with the concept of psychohistory. This is an imaginary mathematical mechanism for predicting the future, based on an understanding of human psychology and the behaviour of masses of people. In practice, psychohistory was never going to happen. The repeated failures of pollsters who amass vast amounts of data to predict the outcomes of elections, or decisions such as the UKs Brexit referendum, make it clear that people form far too complex a system to enable reliable mathematical predictions of outcomes. Yet game theory does achieve some of the promise of psychohistory by resorting to the classic approach used by science, particularly physics: modelling.

The mathematical models used in physics reduce complex systems to simpler combinations of objects and their interactions. Messy aspects of the system are often ignored (it will be noted that this is happening). So, for example, Newtons familiar laws of motion at first glance dont appear to describe the real world very well. The first law states that an object in motion will keep moving unless acted on by a force. In everyday experience, such countering forces like friction and air resistance are ubiquitous; yet for convenience, models often ignore such things, as they add complexity and can be difficult to account for. This means that the model does not reflect reality without friction and air resistance, once you gave it a push, a ball on a flat surface would roll on for ever. But simplification makes calculations more manageable and gives an approximation to reality. Similarly, game theory uses mathematical models that simplify human interactions and decisions as much as is possible to help understand those processes.

The theory of games started with the development of the mathematical field of probability to deal with gambling games and other pastimes where the outcome was dependent on a random source, such as the throw of dice or the toss of a coin. However, in the first half of the twentieth century, a handful of individuals and a quasi-governmental American institution took some of the basic mathematics of games and began to apply it to decision-making problems, ranging from economics to the best strategy to win a nuclear war.

The field that was developed under the name of game theory became detached from real games. It was all about strategy what was the best approach to win, given a set of choices available to two or more players. Games were transformed from pastimes to something deadly serious. This shift was so strong that often those who deal with game theory totally ignore what the rest of the world calls games. However, I believe that this is a mistake. Real games still form part of the continuum it is just that many familiar games are not interesting from a game theory perspective, either because they are too dependent on random chance, with no strategy, or because they are too complex for strategies to be developed.

Its worth spending a moment on the strategy word here, as it is often misused, and game theory has its own specialist meaning for the term. A strategy is a plan to achieve a goal. However, as J.D. Williams pointed out in his light-hearted 1960s book The Compleat Strategyst, in game theory, a strategy designates any complete plan. In general usage, a strategy is usually a best effort to achieve something. But in game theory, a strategy is any complete plan for playing the game, no matter how good or bad. In chess, for example, your strategy could be to always play the piece closest to the bottom left-hand corner of the board that is available to move. Such a strategy would pretty much guarantee losing, but it would nevertheless be a strategy in game theory terms.

Much early game theory was developed to deal with situations where two players went head-to-head in an aggressive win-or-lose situation. This was the circumstance, for example, facing American military strategists when applying game theory to nuclear warfare and whether it was better to be reactive or pre-emptive when it came to nuclear strikes (arguably more a lose-lose scenario than win-or-lose). However, the most valuable impact of game theory in recent years has been in the design of specialist mechanisms to deal with spectrum auctions.

Selling a spectrum

The word spectrum suggests that these auctions are something to do with selling off an array of colours, but here a different part of the electromagnetic spectrum is under consideration: not visible light, but the segment of radio frequencies available for, usually, mobile phones and wi-fi.

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