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Differential Equations

An Introduction to Nonlinear Partial Differential Equations - download pdf or read online

By J. David Logan

ISBN-10: 0470225955

ISBN-13: 9780470225950

Compliment for the 1st version:

"This publication is definitely conceived and good written. the writer has succeeded in generating a textual content on nonlinear PDEs that isn't in basic terms rather readable but additionally available to scholars from assorted backgrounds."
—SIAM Review

A useful advent to nonlinear PDEs and their real-world applications

Now in a moment version, this well known publication on nonlinear partial differential equations (PDEs) includes improved assurance at the crucial subject matters of utilized arithmetic in an straight forward, hugely readable layout and is available to scholars and researchers within the box of natural and utilized arithmetic. This publication offers a brand new specialize in the expanding use of mathematical functions within the lifestyles sciences, whereas additionally addressing key issues comparable to linear PDEs, first-order nonlinear PDEs, classical and vulnerable strategies, shocks, hyperbolic structures, nonlinear diffusion, and elliptic equations. not like similar books that usually basically use formal proofs and thought to illustrate effects, An advent to Nonlinear Partial Differential Equations, moment variation takes a simpler method of nonlinear PDEs via emphasizing how the implications are used, why they're very important, and the way they're utilized to genuine problems.

The intertwining courting among arithmetic and actual phenomena is chanced on utilizing targeted examples of functions throughout quite a few parts corresponding to biology, combustion, site visitors move, warmth move, fluid mechanics, quantum mechanics, and the chemical reactor conception. New good points of the second one version additionally include:

  • Additional intermediate-level workouts that facilitate the advance of complicated problem-solving skills

  • New functions within the organic sciences, together with age-structure, development formation, and the propagation of diseases

  • An extended bibliography that enables extra research into really expert topics

With person, self-contained chapters and a wide scope of assurance that gives teachers the pliability to layout classes to fulfill particular pursuits, An advent to Nonlinear Partial Differential Equations, moment variation is a perfect textual content for utilized arithmetic classes on the upper-undergraduate and graduate degrees. It additionally serves as a invaluable source for researchers and execs within the fields of arithmetic, biology, engineering, and physics who wish to extra their wisdom of PDEs.

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Extra info for An Introduction to Nonlinear Partial Differential Equations

Sample text

0 Example. (Dzfluszon Equation) The diffusion equation cannot propagate nonconstant wavefronts. To verify this fact, we substitute u = f ( z ) . where z = z - ct. into the diffusion equation ut = Du,, to obtain the following ordinary differential equation for the wave profile f : -cf’(z) = D f ” ( z ) . z E R This linear differential equation has the general solution f(z) =a + be-“”/D. where a and b are arbitrary constants. The only possibility for f to be constant at both plus and minus infinity is to require b = 0.

The wavelength). The wave equation is generally regarded as the prototype of a hyperbolic equation, and the term dzsperszve is reserved for equations where the phase velocity depends on k . g.. a group of animals dispersing). and it is important to be aware of this. Example. (Schrodinger Equatzon) In quantum mechanics, the Schrodinger equation for a free particle. under appropriate scalings, is ut = zu,,. It is easy to see that the dispersion relation is w = k 2 , so that the Schrodinger equation is dispersive.

For appropriately chosen dimensionless variables and u. 6. Show that the nonlinear growth-diffusion equation st = k(S3),, + a s can be reduced to the porous medium equation by the transformations S = p(z,t)eat, T = -e1 2at 2a . 7 . Consider a porous medium where the fluid is water. and assume that the density p is constant. What equation must the pressure p satisfy? Describe the pressure distribution. 8. Nondimensionalize the growth-advection-diffusion equation ut = Dux, - cu, + ru. 9. The population density u ( z .

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An Introduction to Nonlinear Partial Differential Equations by J. David Logan


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