Continuing the Science for Everyone Series we now come to *Differential Equations in Applications* by *V. V. Amel’kin*

From the back cover:

This book is an easy-reading introduction to ordinary differential equations and their use in the study of real phenomena and processes. Problems taken from various fields of knowledge illustrate the tools used in setting up differential equations and the methods employed in their qualitative investigation. The book should be useful to high-school students, teachers of science courses, college students, and specialists of, non-mathematical professions who use mathematics in their work.

The book discusses many interesting problems and has 2 chapters. The first one is dedicated to constructing the differential models and finding their solutions. The second chapter is more interesting, it shows you the way to deal with differential equations *qualitatively*.

The book was translated from the Russian by *Eugene Yankovsky* and was first published by Mir in 1990. This I think was one of the last books published by Mir, as after that the USSR came apart and so did all these wonderful state run publishers.

You can get the book here.

Password, if needed: *mirtitles*

4-shared link here

Password, if required, for 4shared files:

www.mirtitles.org

*Problems*? See FAQs

Update: New link has been posted, earlier link was missing pages 180-181. Thanks Khalid for reporting this.

**Contents**

**Chapter 1. Construction of Differential Models and Their Solutions 11**

1.1 Whose Coffee Was Hotter? 11

1.2 Steady-State Heat Flow 14

1.3 An Incident in a National Park 18

1.4 Liquid Flow Out of Vessels. The Water Clock 26

1.5 Effectiveness of Advertising 30

1.6 Supply and Demand 32

1.7 Chemical Reactions 34

1.8 Differential Models in Ecology 38

1.9 A Problem from the Mathematical Theory of Epidemics 44

1.10 The Pursuit Curve 51

1.11 Combat Models 55

1.12 Why Are Pendulum Clocks Inaccurate? 69

1.13 The Cycloidal Clock 73

1.14 The Brachistochrone Problem 81

1.15 The Arithmetic Mean, the Geometric Mean, and the Associated Differential Equation 88

1.16 On the Flight of an Object Thrown at an Angle to the Horizon 93

1.17 Weightlessness 96

1.18 Kepler’s Laws of Planetary Motion 100

1.19 Beam Deflection 112

1.20 Transportation of Logs 119

**Chapter 2. Qualitative Methods of Studying Differential Models 136**

2.1 Curves of Constant Direction of Magnetic Needle 136

2.2 Why Must an Engineer Know Existence and Uniqueness Theorems? 143

2.3 A Dynamical Interpretation of Second-Order Differential Equations 155

2.4 Conservative Systems in Mechanics 162

2.5 Stability of Equilibrium Points and of Periodic Motion 176

2.6 Lyapunov Functions 184

2.7 Simple States of Equilibrium 189

2.8 Motion of a Unit—Mass Object Under the Action of Linear Springs in a Medium with Linear Drag 195

2.9 Adiabatic Flow of a Perfect Gas Through a Nozzle of Varying Cross Section 203

2.10 Higher-Order Points of Equilibrium 211

2.11 Inversion with Respect to a Circle and Homogeneous Coordinates 218

2.12 Flow of a Perfect Gas Through a Rotating Tube of Uniform Cross Section 223

2.13 Isolated Closed Trajectories 236

2.14 Periodic Modes in Electric Circuits 250

2.15 Curves Without Contact 260

2.16 The Topographical System of Curves. The Contact Curve 263

2.17 The Divergence of a Vector Field and Limit Cycles 270

*Selected Readings 274*

**Appendices 275**

Appendix 1. Derivatives of Elementary Functions 275

Appendix 2. Basic Integrals 278

Thank you very much, this is effectively a great book ! There are things that I studied only during the last year of my M.-Eng. degree. I notice that pages 180 and 181 are missing: do we lose important information on these two pages?

Khalid,

I have updated the link with all the pages. Thanks for bringing this to notice.

D

Hi damitr,

Do you have “A course in higher mathematics” by Smirnov books (5 vols). I am able to download from other websites the first two volumes, can’t find the last three volumes. Could you please let me know if you have them.

Thanks,

KK

KK

I do not have any of Smirnov’s volumes. Sorry,

D

Hi Damitr, the link is showing no file to download….

See this.

Hi do you have MISHA

Should i create an account in 4shared to download this book?