Thinking About Equations: A Practical Guide for Developing Mathematical Intuition in the Physical Sciences and EngineeringISBN: 9780470186206
258 pages
July 2009

Equations play a central role in problem solving across various fields of study. Understanding what an equation means is an essential step toward forming an effective strategy to solve it, and it also lays the foundation for a more successful and fulfilling work experience. Thinking About Equations provides an accessible guide to developing an intuitive understanding of mathematical methods and, at the same time, presents a number of practical mathematical tools for successfully solving problems that arise in engineering and the physical sciences.
Equations form the basis for nearly all numerical solutions, and the authors illustrate how a firm understanding of problem solving can lead to improved strategies for computational approaches. Eight succinct chapters provide thorough topical coverage, including:
 Approximation and estimation
 Isolating important variables
 Generalization and special cases
 Dimensional analysis and scaling
 Pictorial methods and graphical solutions
 Symmetry to simplify equations
Each chapter contains a general discussion that is integrated with workedout problems from various fields of study, including physics, engineering, applied mathematics, and physical chemistry. These examples illustrate the mathematical concepts and techniques that are frequently encountered when solving problems. To accelerate learning, the worked example problems are grouped by the equationrelated concepts that they illustrate as opposed to subfields within science and mathematics, as in conventional treatments. In addition, each problem is accompanied by a comprehensive solution, explanation, and commentary, and numerous exercises at the end of each chapter provide an opportunity to test comprehension.
Requiring only a working knowledge of basic calculus and introductory physics, Thinking About Equations is an excellent supplement for courses in engineering and the physical sciences at the upperundergraduate and graduate levels. It is also a valuable reference for researchers, practitioners, and educators in all branches of engineering, physics, chemistry, biophysics, and other related fields who encounter mathematical problems in their daytoday work.
Acknowledgments.
List of WorkedOut Example Problems.
1 Equations Representing Physical Quantities.
1.1 Systems of Units.
1.2 Conversion of Units.
1.3 Dimensional Checks and the Use of Symbolic Parameters.
1.4 Arguments of Transcendental Functions.
1.5 Dimensional Checks to Generalize Equations.
1.6 Other Types of Units.
1.7 Simplifying Intermediate Calculations.
Exercises.
2 A Few Pitfalls and a Few Useful Tricks.
2.1 A Few Instructive Pitfalls.
2.2 A Few Useful Tricks.
2.3 A Few “Advanced” Tricks.
Exercises.
3 Limiting and Special Cases.
3.1 Special Cases to Simplify and Check Algebra.
3.2 Special Cases and Heuristic Arguments.
3.3 Limiting Cases of a Differential Equation.
3.4 Transition Points.
Exercises.
4 Diagrams, Graphs, and Symmetry.
4.1 Introduction.
4.2 Diagrams for Equations.
4.3 Graphical Solutions.
4.4 Symmetry to Simplify Equations.
Exercises.
5 Estimation and Approximation.
5.1 Powers of Two for Estimation.
5.2 Fermi Questions.
5.3 Estimates Based on Simple Physics.
5.4 Approximating Definite Integrals.
5.5 Perturbation Analysis.
5.6 Isolating Important Variables.
Exercises.
6 Introduction to Dimensional Analysis and Scaling.
6.1 Dimensional Analysis: An Introduction.
6.2 Dimensional Analysis: A Systematic Approach.
6.3 Introduction to Scaling.
Exercises.
7 Generalizing Equations.
7.1 Binomial Expressions.
7.2 Motivating a General Expression.
7.3 Recurring Themes.
7.4 General yet Simple: Euler’s Identity.
7.5 When to Try to Generalize.
Exercises.
8 Several Instructive Examples.
8.1 Choice of Coordinate System.
8.2 Solution Has Unexpected Properties.
8.3 Solutions in Search of Problems.
8.4 Learning from Remarkable Results.
Exercises.
Index.
William A. Friedman, PhD, is Emeritus Professor at the University of Wisconsin and Affiliate Professor at the University of Washington. A Fellow of the American Physical Society, Dr. Friedman has over forty years of academic experience and has authored more than one hundred journal articles in the field of nuclear physics.
Thinking About Equations: A Practical Guide for Developing Mathematical Intuition in the Physical Sciences and Engineering (US $72.95)
and Mathematical Methods in the Physical Sciences, 3rd Edition (US $192.95)
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