A Course in Mathematical Methods for Physicists by Russell L. Herman

By Russell L. Herman

Creation and ReviewWhat Do i have to recognize From Calculus?What i want From My Intro Physics Class?Technology and TablesAppendix: Dimensional AnalysisProblemsFree Fall and Harmonic OscillatorsFree FallFirst Order Differential EquationsThe uncomplicated Harmonic OscillatorSecond Order Linear Differential EquationsLRC CircuitsDamped OscillationsForced SystemsCauchy-Euler EquationsNumerical ideas of ODEsNumerical Read more...

summary: creation and ReviewWhat Do i must understand From Calculus?What i want From My Intro Physics Class?Technology and TablesAppendix: Dimensional AnalysisProblemsFree Fall and Harmonic OscillatorsFree FallFirst Order Differential EquationsThe easy Harmonic OscillatorSecond Order Linear Differential EquationsLRC CircuitsDamped OscillationsForced SystemsCauchy-Euler EquationsNumerical suggestions of ODEsNumerical ApplicationsLinear SystemsProblemsLinear AlgebraFinite Dimensional Vector SpacesLinear TransformationsEigenvalue ProblemsMatrix formula of Planar SystemsApplicationsAppendix: Diagonali

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100) 31 32 mathematical methods for physicists and then we rewrite f ( x ) as f (x) = = = = 1 x+2 1 ( x − 1) + 3 1 1 3[1 + 3 ( x − 1)] 1 1 . 1 3 1 + 3 ( x − 1) Note that f ( x ) = 13 g( 13 ( x − 1)) for g(z) = f (x) = 1 1 1 − ( x − 1) + 3 3 1 1+ z . 101) So, the expansion becomes 2 − 1 ( x − 1) 3 3 +... This can further be simplified as f (x) = 1 1 1 − ( x − 1) + ( x − 1)2 − . . 3 9 27 Convergence is easily established. The expansion for g(z) converges for |z| < 1. So, the expansion for f ( x ) converges for | − 13 ( x − 1)| < 1.

Such functions are useful in representing hanging cables, unbounded orbits, and special travelling waves called solitons. They also play a role in special and general relativity. Hyperbolic functions are actually related to the trigonometric functions, as we shall see after a little bit of complex function theory. For now, we just want to recall a few definitions and identities. 4): Solitons are special solutions to some generic nonlinear wave equations. They typically experience elastic collisions and play special roles in a variety of fields in physics, such as hydrodynamics and optics.

0 In this case we see that the sum, when it exists, is a simple function. In fact, when x is small, we can use this infinite series to provide approximations to the function (1 − x )−1 . If x is small enough, we can write (1 − x ) −1 ≈ 1 + x. 6a we see that for small values of x, these functions do agree. Of course, if we want better agreement, we select more terms. 6b we see what happens when we do so. The agreement is much better. 7 that keeping only quadratic terms may not be good enough. Keeping the cubic terms gives better agreement over the interval.

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