D. Gurarie's classes

Math224 Supplementary material

Notes (pdf, tif) and Mathematica notebooks.


Math 224 Home | Homework problems - solutions; Exams | Projects

 

Ch.1: First order DE

1. DE Models: General outline

Notes/handouts: Models.pdf. Additional: models; chemical kinetics

2. Analytic solutions: method of separation

ii) Intro to Mathematica: Easy Mathematica (Wolfram alpha; Wolfram CDF-player )

Real Mathematica in 20 minutes. DE-solutions with Mathematica; Integrating separable DE,

iii) Applications of Linear DE: CR-circuits-Mixing.pdf. Discontinuous DE.nb

iv) Logistic US-population;.Data fit nb.

Extra : Sliding down a slope; Poisseuille flow and CR –circuit; Flight with friction.pdf

3. Qualitative methods: slope-field.

DEtools package for Mathematica 6/7 by Selwyn Hollins (follow installation instructions) Basic examples.nb

4. Numeric Methods (Euler): Excell ; Euler.nb. Uniqueness/existence: pdf

5. Phase-line, Equilibria, Bifurcations: notes; nb

Extra: Fisheries in decline (NYT; Wild Fisheries in 45 Years)

6. First order Linear equations and multipliers

i) LDE, Linear Superposition, Undetremined coefficients

ii) Multipliers: pdf; nb

ii) Applications of multipliers; Mixing.pdf

iii) Rocket science.

7. Other techniques:

Change of variables, Riccati eq-n(notes; nb). Extra: fastest slope ( tif; nb )


Ch.2: Differential systems

2.1-3. Modeling with differential systems

i) Notes on DS models Phase plane: nb (same with DifEqs package nb)

Extra: Kepler problem

2.4. Euler method for systems:nb, Excel

Nonlinear oscillators: Duffing and P-delta; nb (non linear oscillators). Equilibira types: nb

SIR model of epidemics: notes (section 2.6); nb

2.5. Lorenz 3D system: strange attractors and chaos (lorenz.nb)

Additional: notes on Rayleigh-Benard convection.Wikipedia: Edward J. Lorenz ; Lorenz attractor.

Weather patterns animations: 3D Lorenz; Higher-D truncated convective system (110 equations)


Ch. 3: Linear Differential systems

3.1. Linear DS- models: notes; DSolve for LDS.nb

3.2-3: Eigenvalue method: Examples; Eigenvalue demo.nb; Eigenvalues.nb

3.4: Complex eigenvalues (spirals and centers): Notes

3.5: Repeated and zero eigenvalues notes

Applications to LDS models: notes . Migration.pdf.

3.7: Equilibria and Bifurcations: Notes (trace-determinant plane), nb

3.8: 3D systems (Linearized Lorenz DS): notes; nb.

Extra topics: Matrix Exponential.pdf, and nb

Tracking moving target nb

Population dynamics tif, data table, UN link.


Ch.4: 2nd and higher order Linear DE

4.1- 3.6: Characteristic polynomial and Method of undetermined coefficients: notes, damped free-oscillations.nb

4.2-3: Forced oscillation: Modulation and Resonance (notes; additional pdf).

nb: Periodically forced oscillations; Qualitative analysis: modulation and resonance

Additional topics: i) LRC-circuits.

ii) Heat-diffusion and Boundary Value Problems; nb

iii) Coupled oscillators and propagating waves: notes; nb


Ch. 5: Nonlinear systems

5.1-2: Nonlinear models. Phase plot nb

5.2: Equilibria, linearization, stability. Volterra-Lotka competition: Example. Analysis.

5.3-4: Hamiltonian and Conservative systems. Gradient and Dissipative systems: pdf; summary of Hamiltonian and Gradient DS

Notebooks: Hamiltonian and gradient; VL predator-prey cycles ; Linear and nonlinear oscillations

Bifurcations pdf ; nb

5.5: 3D systems.nb. Food chain and Lorenz system "chaotic weather "

5.6: Forced nonlinear oscillations and chaos nb


Ch.6: Laplace transform

6.1. Basic Laplace transform (nb).

6.2. Forced oscillations via Laplace transform: nb. Square-wave

6.3. Delta-function (nb) and convolution (nb). Bumpy road nb. Fundamental solutions and variation of parameters pdf .


Project List

  1. Harvesting logistic population
  2. Bernoulli equations
  3. Possum epidemics
  4. Lab 5.4 (ch.5) (glider)
  5. Predator-prey with satiation
  6. Projects from Boyce-Brannan ch.7

Selected presentations

HIV drug resistence


E-mail: dxg5@case.edu Phone: (216) 368-2857